Malicious PDF — malware analysis report

Static analysis result for SHA-256 1918a0a77f3bd4c7…

MALICIOUS

PDF

79.6 KB Created: 2021-03-05 03:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4a00437d0aa2ada4a5beda8cf60ec18a SHA-1: 5b994e92abec45939dff43640d7e3b5bdc0df873 SHA-256: 1918a0a77f3bd4c7fc5bee7ab02d134bccdeee616ea35d4a7301e4b84df157c8
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 or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/123?utm_term=is+netgear+orbi+any+good PDF link annotation
    • https://gefidiwe.weebly.com/uploads/1/3/0/7/130738847/lukewidasovufabidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_6035c7e2d839d.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/hitjjhb/xinawanomavunewudafav.pdfIn PDF document text
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/pugotirirazi.pdfIn PDF document text
    • https://vezisadorudaruj.weebly.com/uploads/1/3/4/3/134349324/133851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387589/normal_6020c0d611a2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503033/normal_602004f168e3e.pdfIn PDF document text
    • http://futup.ru/xuvamulagolafakerazpfhvt.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/pharmacology_textbooks_free.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/givoroxalovurafaj.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/jubutagawozeratu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_602858bec2361.pdfIn PDF document text
    • http://koolmaxt.online/1992_yamaha_timberwolf_250_top_speedjo6p9.pdfIn PDF document text
    • http://samo-katim.ru/karcher_pressure_washer_pump_repairq9wcg.pdfIn PDF document text
    • https://jebupamix.weebly.com/uploads/1/3/6/0/136098333/zekovubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417806/normal_5fdc5d051c142.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/eidOFij/economic_history_of_europe_timeline.pdfIn PDF document text
    • http://tersq.fun/bajufozusizudixuginov6ifp.pdfIn PDF document text
    • http://cucoupon.info/sakitutamakenef15mbx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_fb12348980b74d8da0b341a60ce35dde.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_e5e87e23ee4b4f7e9872f210b7ab7d81.pdf?index=trueIn PDF document text
    • http://gumomexad.onlinewebshop.net/crochet_seed_stitch_baby_blanket_pattern.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/edge_of_the_empire.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_e6939b412334422aa457f75d7f8e96f8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 4928 bytes
SHA-256: d6770f569413756d18a3103ca7bf8f52219a0f9ddd85b5b01d4d03e6bce6182b
font_01_sfnt_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 10656 bytes
SHA-256: 4b7268f8bce8712f813c68af29fe436543567ca5c36ee554bb26178fe188035a
font_02_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3