Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aef0d3ee21b275d…

MALICIOUS

PDF

80.8 KB Created: 2021-03-14 19:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9ab36ec246900c3549008fc349c433a7 SHA-1: ef5c953b9b85754de1f962183dd8749135342600 SHA-256: 2aef0d3ee21b275d8fe191ef623cd89d2d9dd1c72d43554b84432e21145a5396
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be junk data, reinforcing the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=tools+of+the+trade+chemistry+lab+equipment+worksheet In PDF document text
    • http://wssummer.space/98444828242bnrc4.pdfIn PDF document text
    • https://fabirakarag.weebly.com/uploads/1/3/2/7/132710689/09ed983344.pdfIn PDF document text
    • https://bipagaposelugi.weebly.com/uploads/1/3/4/4/134479594/e983bcd1c.pdfIn PDF document text
    • https://buvaranugabenu.weebly.com/uploads/1/3/0/8/130873820/ravameju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_600bc6afb22b4.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/elements_of_metaphysical_poetry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473052/normal_601fad6933972.pdfIn PDF document text
    • https://detabifaf.weebly.com/uploads/1/3/1/4/131436978/fimemeji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405413/normal_5fe5fa82e4526.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451756/normal_5fff5ff84d291.pdfIn PDF document text
    • http://50off.pro/20247275554x12pz.pdfIn PDF document text
    • https://remurefovedelag.weebly.com/uploads/1/3/1/8/131860204/noxesejoboxu_xigenezume.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/jewoxoririx.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/582cdd92-a43d-4ee5-b1e4-dc648e63db16/how_to_deal_with_daughters_broken_heart.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_ccbecd1dc2614cd8b22b9657da0ab797.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74024ba-aef9-4fc9-adcd-75d7231b3e50/blackburn_trakstand_ultra.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_c05aa616dcbc4494ad2213641107bb4b.pdf?index=trueIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_0e053db690da4f7e9e9c3486fba95db8.pdf?index=trueIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_4cd2ff9ff03b4039b0fb1c53710ec3e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e06307f-3da8-41c4-b866-09de135fc26b/why_is_my_hotpoint_tumble_dryer_not_spinning.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_4496c67b92dc441fbf7858f9285508f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3410f8d6-dfd6-4d69-a7ea-306e3739d7ce/pet_sematary_1989_cast_then_and_now.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/advanced_excel_tutorial_2016.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 5868 bytes
SHA-256: b21cb8021f02c86e3748979e5e15ae2f3155e5317a73ba1af7ceae75118213ce
font_01_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 10520 bytes
SHA-256: ef7a04f960b4dc2e5b2168f32a543b3d5c32bf4b73c393526d93adb1c8be8d02
font_02_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1