Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1dcb09e90fd92a…

MALICIOUS

PDF

75.8 KB Created: 2021-03-25 16:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 448893f52fd3bc4d39a81d798a551f99 SHA-1: 43d5820187c0383becc07b086ca58b3bdc9be38d SHA-256: 6a1dcb09e90fd92a0eedbde0688bc35a0fe2ce98462cd4a13dcb7cc1d1641071
156 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 of which are SEO-optimized and point to other PDF documents, indicating a link farm designed to attract traffic or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=mini+practice+set+2+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4401518/normal_60505e37c5ba3.pdf
    • http://thelandofbadideas.com/armada_hargai_aku_mp3_stafabandkiwbq.pdf
    • https://xinotetul.weebly.com/uploads/1/3/5/3/135351743/womapan.pdf
    • https://sivajusirev.weebly.com/uploads/1/3/0/8/130814673/66bc74567872d96.pdf
    • http://burrrhey.tech/duchess_of_malfi_act_3_scene_2_analysisypnky.pdf
    • http://saniwofixapu.mygamesonline.org/23279626343.pdf
    • http://zugemenelil.medianewsonline.com/27327091817.pdf
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/1312911.pdf
    • http://gebevojika.mygamesonline.org/carcinoma_basocelular_tratamiento_quirurgico.pdf
    • http://idealslim-ordina.site/fetevuxeteluzelo948u7.pdf
    • https://cdn-cms.f-static.net/uploads/4405945/normal_60320b5e787e8.pdf
    • http://tekdouche.xyz/adobe_printer_free_windows_74hvhu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_c257ff4b8e364f1b846bf23bf3f42367.pdf?index=true
    • http://taroveruwidiba.onlinewebshop.net/silitimobavofururaju.pdf
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_6d937891488e45498744001607631440.pdf?index=true
    • https://s3.amazonaws.com/dezajok/aarum_kanna_malayalam_song.pdf
    • https://s3.amazonaws.com/fopalew/72864075730.pdf
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_acabf36facff444cb9aeced2d1b9db37.pdf?index=true
    • https://s3.amazonaws.com/tubupejevomo/15693362208.pdf
    • https://s3.amazonaws.com/mudurixo/pafuza.pdf
    • https://s3.amazonaws.com/gofilafixu/wofovumipo.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_off0000e4be.bin
b3140b51a8991988195e978ed031befee2566083d1e6ac911aee61b7eaf7e6ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 5280 bytes
font_01_sfnt_off0000f6cd.bin
fd55c5a8212cbb9c8d7b2e5d68069ec9742d4584c5b0798da5537d702b252c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 13188 bytes

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