Malicious PDF — malware analysis report

Static analysis result for SHA-256 825de15b45fc0ffb…

MALICIOUS

PDF

76.5 KB Created: 2021-05-27 16:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: edda7b8c7195f080dfee8e7b4540d8e5 SHA-1: 4934e24312b40617cd9d590d2a0cf35a895ef5c8 SHA-256: 825de15b45fc0ffba4bbbe805f71811779c18219b3c322f5da77e90c48047498
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 services like Weebly, indicating a link farm. This is strongly suggestive of a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support the malicious nature of the file.

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://gixoxiri.weebly.com/uploads/1/3/4/7/134707295/2086030.pdf In PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/tijasufopitoj.pdfIn PDF document text
    • https://bidopafogusiw.weebly.com/uploads/1/3/1/0/131070115/bevolanewemok.pdfIn PDF document text
    • https://juzapojoxop.weebly.com/uploads/1/3/4/3/134370352/2047230.pdfIn PDF document text
    • https://removevas.weebly.com/uploads/1/3/4/4/134443453/7498f.pdfIn PDF document text
    • https://xizilajonufu.weebly.com/uploads/1/3/4/5/134528384/xaxujugik-mitaze-navif.pdfIn PDF document text
    • https://bumozirejukije.weebly.com/uploads/1/3/5/3/135340746/57dd6f.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/1012545.pdfIn PDF document text
    • https://wopedibim.weebly.com/uploads/1/3/4/5/134585971/rojamebeliluzufimedi.pdfIn PDF document text
    • https://siteketu.weebly.com/uploads/1/3/4/3/134362374/5400288.pdfIn PDF document text
    • https://xurolimusogisuw.weebly.com/uploads/1/3/4/3/134395808/nabixigozavuzamagus.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/fitaniretofix.pdfIn PDF document text
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/3778b6aa6d.pdfIn PDF document text
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/jeluripipomi.pdfIn PDF document text
    • https://dikodaselafilug.weebly.com/uploads/1/3/4/1/134108642/bolosazobatax-lalitav-kojeruxiwaro-zafasepobamoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=sennheiser%20ew%20100%20eng%20g4%20a1-bandPDF link annotation
    • https://uploads.strikinglycdn.com/files/bbfb3c89-22e7-460c-b742-7df10052ddc0/chal_jeevi_laiye_full_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b1bf24-fe66-4e23-8c31-838a6e6b0bb7/kitodavelefid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d9a507-6096-47f1-bab7-1b4e74260e2a/52152166005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4010babd-b79f-482e-adcf-c75aef3f6207/michel_foucault_theory_of_power.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 5704 bytes
SHA-256: 9c2ad7f3c45ba1add2239fd12634b6cd169dcf36203c27f940a37d85fd33d738
font_01_sfnt_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 12184 bytes
SHA-256: 7e71cb7750c44f55581583f3b1bf5f3bdd22b13373eee8e3072e760dca2ceb79

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