Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c2fa7537966e30…

MALICIOUS

PDF

78.1 KB Created: 2021-06-09 13:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7f69885022881cca5764ca6acd02c60b SHA-1: 22046d3985d164fa7c529c115ea01113e5c4c691 SHA-256: f8c2fa7537966e306ffcda885bbad04337861a908d05d167807838a8d6660607
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of malicious activity, possibly leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/pbw?utm_term=gre+math+subject+test+practice PDF link annotation
    • https://kofejadadamutu.weebly.com/uploads/1/3/4/3/134348877/satipikare.pdfIn PDF document text
    • https://zapoxafejomazex.weebly.com/uploads/1/3/4/7/134745353/desoro.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/suvakadijuzatow_jovize_tepipopi_romid.pdfIn PDF document text
    • https://gazuxupoje.weebly.com/uploads/1/3/4/1/134108966/c9f0dd8df8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493589/normal_6007cb4cc6f3b.pdfIn PDF document text
    • https://renepavavoz.weebly.com/uploads/1/3/4/0/134012855/gikeged-tozulekutine-nopomide-deboxewubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_60bba9a98a9a4.pdfIn PDF document text
    • https://divuleveberu.weebly.com/uploads/1/3/7/5/137502180/gareto-vebeb-zemokebulux.pdfIn PDF document text
    • https://nefopenexa.weebly.com/uploads/1/3/0/7/130739549/rerezibotanab_kuvuzazexogeb.pdfIn PDF document text
    • https://sirunolova.weebly.com/uploads/1/3/5/3/135303996/fekex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368475/normal_5fca6f2ef019c.pdfIn PDF document text
    • https://keroxoxelesiz.weebly.com/uploads/1/3/1/4/131452869/5993705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383925/normal_5fc6801f1bcf6.pdfIn PDF document text
    • https://feminudusur.weebly.com/uploads/1/3/1/4/131407357/jokajazubiwopej_galesekivabamu.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
    • http://gitefov.pbworks.com/w/file/fetch/144465726/19121871811.pdfIn PDF document text
    • http://gibabug.pbworks.com/w/file/fetch/144575184/74669884366.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144501654/woxamaxevubasikararasof.pdfIn PDF document text
    • http://lolobeki.pbworks.com/w/file/fetch/144935610/15_months_boy_weight_in_kg.pdfIn PDF document text
    • http://vevokofeju.pbworks.com/w/file/fetch/144870867/74148804022.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/nitotu.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/w/file/fetch/144448068/vebikukibafanato.pdfIn PDF document text
    • http://sovamexor.pbworks.com/f/96994680438.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/vapikeguf.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 5056 bytes
SHA-256: 7695060a1084479514d6871e2f9f05efb0bf5f89a8932ea4d4df730f4fd6e9f4
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 13504 bytes
SHA-256: 08cdd393d10fda1ab155c32887ee53f805ca03041786b7fd937b33639dd1c8f3
font_02_sfnt_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3