Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f14121a93f4bd7…

MALICIOUS

PDF

110.9 KB Created: 2021-06-04 22:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 16ec9939a92a5ea6281bcf1d3228e5b7 SHA-1: 045bf6a38e1e0f75ac257bd59d5ca1bf126acf22 SHA-256: 89f14121a93f4bd76f5b250d1a4a489f966218df71bdbf3d53edcbb0746c4a50
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document's content, though heavily obfuscated, appears to be a lure for users seeking practice answers, which is a common tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=21.+4+faulty+parallelism+practice+1+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381291/normal_606e35b2ab94e.pdfIn PDF document text
    • https://xavedogaw.weebly.com/uploads/1/3/4/6/134659805/vosad.pdfIn PDF document text
    • https://jugusunoju.weebly.com/uploads/1/3/4/6/134625161/wuvavuxita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411270/normal_600820cde5583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_600b9f3c33996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_604d39500b273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489981/normal_5fd64f299c3c2.pdfIn PDF document text
    • https://nuzunuge.weebly.com/uploads/1/3/5/3/135399682/dizaragavenanuxezanu.pdfIn PDF document text
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/ec5df3.pdfIn PDF document text
    • https://tamilazubi.weebly.com/uploads/1/3/4/6/134604156/6292951.pdfIn PDF document text
    • https://fuvodaxe.weebly.com/uploads/1/3/1/3/131379021/5830562.pdfIn PDF document text
    • https://bonizilolalov.weebly.com/uploads/1/3/4/4/134458774/1e9b9a0c4e64349.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://fuxedemama.pbworks.com/w/file/fetch/144494619/my_bosch_tumble_dryer_keeps_stopping.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144422373/how_long_it_takes_for_tadpoles_to_turn_into_frogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63e81d8-57c5-47ab-b55a-4b698b5f31f2/mibemezisen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ed2db1-8c1d-47ff-a194-0a460f8250e9/waxusuwoxonorunirapoxo.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/ratexifegotox.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_off00016750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16750 5336 bytes
SHA-256: caa8fa73297528e5fa3505b1cc5b61b94c170a977746d8121a3c0779215efec5
font_01_sfnt_off00017974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17974 11324 bytes
SHA-256: 6f039c9855421e7acc36aa91028a7e36fdf810c360201746cab4f73a0047d8fa
font_02_sfnt_off00019fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FB8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

Open this report in the interactive analyzer, or submit your own file for analysis.