Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21bb2f32aeb0487…

MALICIOUS

PDF

78.0 KB Created: 2021-04-06 23:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 527fb28685b125d124e6a24a2a1783ac SHA-1: bacdc46a161a8f778caabb71694bd7c5885b9a1f SHA-256: c21bb2f32aeb04871195e4966828d69f0f125ce82fd489cfc9588fe1d0126b41
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDFs, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/wix?keyword=lg+side+by+side+refrigerator+service+manual
    • https://cdn-cms.f-static.net/uploads/4427506/normal_60524c0455120.pdf
    • https://vinetiwufo.weebly.com/uploads/1/3/5/3/135305890/10912a93b766.pdf
    • https://cdn-cms.f-static.net/uploads/4426421/normal_6046e32d1b6fd.pdf
    • https://widetidutu.weebly.com/uploads/1/3/1/4/131453832/wevevaduvupituso.pdf
    • https://cdn-cms.f-static.net/uploads/4412174/normal_603310e2a6137.pdf
    • https://static.s123-cdn-static.com/uploads/4487419/normal_5fccd6dc2d356.pdf
    • http://nabuxusamabola.iblogger.org/adobe_illustrator_cc_bangla_tutorial.pdf
    • https://cdn-cms.f-static.net/uploads/4371240/normal_6014f3b8f009f.pdf
    • http://vulenawaxoki.iblogger.org/classifying_quadrilaterals_chart.pdf
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5fd0ded5b45f2.pdf
    • http://zexixojusikor.iblogger.org/around_the_world_in_80_days_full_movie_in_hindi_download_720p.pdf
    • https://cdn-cms.f-static.net/uploads/4376852/normal_603d7c7c1921e.pdf
    • https://cdn-cms.f-static.net/uploads/4466391/normal_6014155810bb8.pdf
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/gisuwokususedavewatu.pdf
    • https://cdn-cms.f-static.net/uploads/4464313/normal_602349bbe1272.pdf
    • http://pimavegi.22web.org/tamemu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0b37680b-406b-4d57-99b2-f8cd0b32048c/how_does_urea_diffuse.pdf
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_f3c98ba04c4040d4b2137f3611b6eb61.pdf?index=true
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_335b8463ef5943d89c982df079352941.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f80c7b4-546b-4b72-9b35-ad9b8d3a047e/hp_laserjet_1100_driver_windows_10.pdf
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_f5e30d0a95714b6393acc82b7ad348d3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f3321523-7cab-4d08-959b-95768b9697d9/81133458379.pdf
    • http://kotazok.epizy.com/88684116448.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ae.bin
942c47024bbb36402ca181e4e0e41c19789853ff56605e568ee4bb9024b9dd72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 5584 bytes
font_01_sfnt_off000107ac.bin
fe4d480c89d8b4e1ed27b1978b74970efa861d9064419b710fc464222b928000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 10176 bytes

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