Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e1380a0b4ef623…

MALICIOUS

PDF

78.6 KB Created: 2021-03-28 20:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3a08f6ec5fe0c93924d0176e083cf29 SHA-1: 64265df9729633af24843714f89de453a16ef708 SHA-256: 25e1380a0b4ef623690651789720bcfdadbade7f6da656c0589e79030cf06555
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, with one prominent URL leading to a potential phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=metric+mania+length+answer+key
    • https://momosedudufapi.weebly.com/uploads/1/3/4/6/134622660/fapepalur.pdf
    • http://shopsmmv.site/76843170905p9ihh.pdf
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/zobugafasitifuj.pdf
    • https://cdn-cms.f-static.net/uploads/4453108/normal_603719c6a8e30.pdf
    • https://linugezi.weebly.com/uploads/1/3/4/2/134265501/zawejiwidameg.pdf
    • http://onlinetyz.xyz/how_to_set_up_your_fishing_pole_for_troutpc5fp.pdf
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/d50204056458.pdf
    • https://fimiwopagib.weebly.com/uploads/1/3/5/3/135315251/vinefuvefi-gexusi-rinogakudugife.pdf
    • http://cardioactiveitalia.site/wotinoneroxonizalopeputavbs9xi.pdf
    • http://insurancesouk.com/sumupewexikoxatukopewegotsyo9s.pdf
    • https://cdn-cms.f-static.net/uploads/4380070/normal_603bc45bc9426.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wetowuzuxit/38235636222.pdf
    • https://s3.amazonaws.com/bepukuba/bob_stroller_revolution_flex_2.0.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/ludotuxuzap.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/20785007245.pdf
    • https://s3.amazonaws.com/rupatojuko/beginning_boutique_returns_form.pdf
    • https://uploads.strikinglycdn.com/files/7158c287-a299-4528-8e0b-889b2b72f4f0/lifetime_basketball_hoops_customer_service.pdf
    • https://s3.amazonaws.com/gofilafixu/apa_format_website_citation.pdf
    • https://uploads.strikinglycdn.com/files/00b60b45-4109-4de8-97fc-37c088543d8c/scholarship_essays_for_high_school_students.pdf
    • https://s3.amazonaws.com/sisaxu/sql_server_date_format_codes_101.pdf
    • https://uploads.strikinglycdn.com/files/89eb2255-b3b9-4e4e-8091-0f0441a30dde/tc_electronic_hall_of_fame_mini_shimmer.pdf
    • https://s3.amazonaws.com/kotenu/sword_art_online_novel_19.pdf
    • https://uploads.strikinglycdn.com/files/63af4d12-404a-4d44-bf49-4d6224f27131/pidazewebukabu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ab.bin
c78a69f1d5dc4945a6553789ed520105893340dd66231a5f340d483d8401ccbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 5156 bytes
font_01_sfnt_off0000fb0e.bin
43bb81416bc0bc2bbdc45093ea31700a69fef27933e6e05894af23ae01f632d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 10504 bytes
font_02_sfnt_off00011f0b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 4324 bytes

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