Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c92e84226b4d4d…

MALICIOUS

PDF

83.9 KB Created: 2021-03-08 15:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cf8d7dd52f5804cb26a32f05c8172f57 SHA-1: 35d58bc0277c60f95d81596e30a3bb789943eece SHA-256: 89c92e84226b4d4dc55aac1d28f563fd1d666ef1802f8da6c846cb7611aa5187
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jacksth.ru/award?keyword=angiotensina+ii+pdf PDF link annotation
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/zamogebulerokar.pdfIn PDF document text
    • https://zuxijonimobazi.weebly.com/uploads/1/3/5/3/135351106/xabev.pdfIn PDF document text
    • http://smallita.space/kesafomixusezimvmoti.pdfIn PDF document text
    • http://loginwithfb.site/wesepovapowonaluwuz94sz5.pdfIn PDF document text
    • https://mogivara.weebly.com/uploads/1/3/2/7/132712472/bililowaz-pibovu-rejuvotek-xajex.pdfIn PDF document text
    • http://chatik85939775.fun/541307032455fs56.pdfIn PDF document text
    • https://bativazuwa.weebly.com/uploads/1/3/0/9/130969541/9f04dcd3cd5bfc3.pdfIn PDF document text
    • http://fbcopyright-center.com/39749246030al5zo.pdfIn PDF document text
    • https://zisifogadudup.weebly.com/uploads/1/3/4/7/134765868/7ae5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b1681b-0fa8-442e-9af6-0f599b4bbcff/lozitaxeraruxidiwil.pdfIn PDF document text
    • http://wodasekewu.epizy.com/58929206361.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_d0c6801c48d7478e87f1a3b3447ffbce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fea8574-2dde-4237-8ef8-9b58980f1738/matlab_function_file_input.pdfIn PDF document text
    • http://wipedeposadav.rf.gd/84406502281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dad08b8-c12b-46d6-94ba-e07d69cae29e/pifigudovuwido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2125d4-f09e-4df1-8b58-9e16666ad410/68096037212.pdfIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_8f3b892947a14a2695eea42cdb944a7a.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_c5dbbb54b32c437eb0dbc2162e4094f0.pdf?index=trueIn PDF document text
    • http://sewasijibakel.epizy.com/postur_apbn_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b146af3b-6036-4801-b62c-22fe1ca32586/why_is_my_weber_grill_not_getting_hot_enough.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_25fe56baddfd4d1781c8bc532ae337ef.pdf?index=trueIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 5072 bytes
SHA-256: dd1a1a6134cb6adc0827551a15409e681af1c0859dfbcb4c7538f233c9dd0675
font_01_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 15656 bytes
SHA-256: 6bcd07680b319a98920f3beab8b218284296ad5c5f46cae31405f82f3f2ca392