Malicious PDF — malware analysis report

Static analysis result for SHA-256 434f40f40b8071b6…

MALICIOUS

PDF

101.0 KB Created: 2021-03-23 15:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 45502dbdb8857b7a6f59c3163b7c7614 SHA-1: d86abd49aadfd73d890c0738023a35264d28e146 SHA-256: 434f40f40b8071b6a4f8495b16c9dd8de3649a89fbe21d2154726bc63a382854
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to distribute further malicious content. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/award?keyword=pdf.+js+angular+2+example PDF link annotation
    • https://tenomexob.weebly.com/uploads/1/3/1/1/131163969/bafoziz.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/i6Bbeib/rankin_bass_mad_monster_party_dvd.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/VHGijbo/zukujopi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426071/normal_600630994ce26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_6036f74a098ce.pdfIn PDF document text
    • https://refitefajo.weebly.com/uploads/1/3/2/6/132683069/2269757.pdfIn PDF document text
    • https://tobedetileva.weebly.com/uploads/1/3/5/3/135337372/8837171.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403805/normal_600110995c51c.pdfIn PDF document text
    • https://dezirivudamowi.weebly.com/uploads/1/3/1/8/131856369/4176581.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/8906555.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/iaVzZyB/chicken_shack_near_me_open.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/9aaef0b7a7168.pdfIn PDF document text
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/2427526.pdfIn PDF document text
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/fe6df06a03ed22.pdfIn PDF document text
    • https://kexejimeso.weebly.com/uploads/1/3/4/0/134096016/a0e9802e8afb6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/42520269990.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/54049227452.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/b._ed_cet_result_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43354b4-20de-465a-9fcf-35ea0c1d922d/blade_trio_180_cfx_bnf_basic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f33393e-b990-4492-8a26-2c52e90e9a36/what_is_the_real_story_of_the_blind_side.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d08021-509b-4a3f-960c-8c9dc1128916/daduxukafoxosorimomoxavax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec466b87-3f39-43b1-948c-49a3e15f3c8b/esv_bible_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9e35c2-f4d4-4a48-a38f-db6724dc4c9f/1206739376.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 6424 bytes
SHA-256: 4455747fda9ac97410526ac3fee3ca643cc61cb592146befb7df79af2604d95b
font_01_sfnt_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 5668 bytes
SHA-256: 9a2ff0312e12b4009c8b4e1262dc0a87f53c41b1adb56936e2a400507b3a4fef
font_02_sfnt_off00012370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12370 9608 bytes
SHA-256: e84c8be089ed9204b9f2a997e9d04587f1b15f925c84cb554c1bbde511b413af
font_03_sfnt_off00014473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14473 12208 bytes
SHA-256: caff477b91038cf117b4703f6e85f681954c1b1edc1f1508af82b09101ab35b6
font_04_sfnt_off00016e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E54 16236 bytes
SHA-256: c944f4b152e3b2e3eb6acbc921850bed8f276e421a22a264d9d0c519ccbce87d

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