Malicious PDF — malware analysis report

Static analysis result for SHA-256 04efac42370f169b…

MALICIOUS

PDF

92.7 KB Created: 2021-06-11 09:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 97be8ad9b0b8d394d5af6827887c4e50 SHA-1: c912998a9283d9fe738dc2e0f72a53b10e962cad SHA-256: 04efac42370f169b171ec7e6bfc9483328acc805d2ee9570fac16a19dae667de
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed for SEO manipulation or phishing. The primary URL, 'https://allytemp.ru/pbw?utm_term=pogil+protein+structure+answer+key+pdf', suggests a lure related to academic content to entice clicks. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/pbw?utm_term=pogil+protein+structure+answer+key+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416514/normal_5fd8b15c57612.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413347/normal_6001e3ebbe8c4.pdfIn PDF document text
    • https://fiduwovizeget.weebly.com/uploads/1/3/4/5/134517619/50b3e219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_602f7bc2736ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488817/normal_600f4fc08a306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486206/normal_60606334b4426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_600a3d2b91be6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_60bea3dee6d5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_60bbd8abc446d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500677/normal_60bfe10ea4183.pdfIn PDF document text
    • https://pivufuzonopovi.weebly.com/uploads/1/3/4/5/134588588/8053180.pdfIn PDF document text
    • https://nidozasa.weebly.com/uploads/1/3/4/6/134680612/3971262.pdfIn PDF document text
    • https://makojinoguj.weebly.com/uploads/1/3/1/4/131406607/vawikatelefidefim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5fda89e180994.pdfIn PDF document text
    • https://garizoruzaxa.weebly.com/uploads/1/3/3/9/133986237/e992776c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_600b0f27859ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_60202abd85cd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_60636a6adfa76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pesivop.pbworks.com/w/file/fetch/144875448/27923151627.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/dominican_republic_all_inclusive_with_airfare.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_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 5584 bytes
SHA-256: e5a96fc3b402cea8a0e2c5e175ff2a894686e11e18f5a9bac5786493e5a3bc1f
font_01_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 11524 bytes
SHA-256: 86348940d7e509dafd35177e9b47ffb8840c6a127daf4a3b65cce6e5e24aa664
font_02_sfnt_off00014f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8A 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e