Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c18427cc2343379…

MALICIOUS

PDF

79.5 KB Created: 2021-03-14 20:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 48bc32c2ab027b1daf0bd9940f119c74 SHA-1: 801b25b7d0d19522192dfed658f6bd596bd7b024 SHA-256: 3c18427cc234337920e488d90212eb7d720300b4219d66f2fc791853fbc691c4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded text, though garbled, includes a URL related to battery replacement, which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://seumenha.ru/strik?utm_term=forerunner+405cx+battery+replacement PDF link annotation
    • https://lemirupuzomive.weebly.com/uploads/1/3/2/8/132814022/7746647.pdfIn PDF document text
    • https://goxepafanaba.weebly.com/uploads/1/3/0/7/130739763/6199804.pdfIn PDF document text
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/7935593c98.pdfIn PDF document text
    • https://guxanavos.weebly.com/uploads/1/3/4/2/134235011/viralutexaki_dogarit_xejimulafif_judigenip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470968/normal_5ff3c0574040b.pdfIn PDF document text
    • https://rojanebe.weebly.com/uploads/1/3/1/6/131637229/lazolirepu.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/gabari.pdfIn PDF document text
    • https://kofitabalu.weebly.com/uploads/1/3/0/7/130775223/7750915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_60287b49b2e6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_604318009ba4c.pdfIn PDF document text
    • https://jakipafowikodo.weebly.com/uploads/1/3/1/0/131070805/ae743e8d.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/python_while_loop_list_length.pdfIn PDF document text
    • https://lekozeva.weebly.com/uploads/1/3/5/9/135964777/wulojakatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_603d0b8eb763f.pdfIn PDF document text
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/d08e8b4ee6af40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_602c5ae9a1950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5ff768047e7b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459785/normal_600d5e317fa36.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://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_7322c28d44144d08a32ecb6212c65028.pdf?index=trueIn PDF document text
    • http://nejarisiwudu.atwebpages.com/7544515840.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/jorge_luis_borges_poemas_portugues.pdfIn PDF document text
    • http://lafagelupuf.myartsonline.com/91384945311.pdfIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_88d8eed025fc42bab55c2043b6788949.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_9679c0cd0373491b8c7d214d3859de52.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_a88383944ed5482ba9668ec37368f3da.pdf?index=trueIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_d995d7a4a5d04225b4c26a3d39635d61.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_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 5356 bytes
SHA-256: 8adeadfb61ed2fcd981d5672e3a0076ae23782367ae3a81cee02cdf58a89ee59
font_01_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 10580 bytes
SHA-256: 7f034e49fa47cbcf94910e861aa5122728875f4ae66b427fc860d090f5b76a4c
font_02_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378