Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54b6a38b153ec4c…

MALICIOUS

PDF

83.3 KB Created: 2021-04-13 00:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c50a42c8b2f088c4dbbca2d8868daf63 SHA-1: eca1e1ec67fad3be8e09ebd0c908be5d27126b80 SHA-256: a54b6a38b153ec4c6c219c4c4e94943a7b0a23fc4c1191b7dd635c65e101fee9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URL and the document's structure suggest an attempt to disguise malicious content as a tutorial to encourage user interaction with the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://zajinet.ru/strik?utm_term=unix+shell+scripting+tutorial+with+examples+pdf
    • https://static.s123-cdn-static.com/uploads/4454041/normal_6000e5ee4534f.pdf
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/rijir.pdf
    • https://migabodunezo.weebly.com/uploads/1/3/4/5/134587819/xuxinuratusumet.pdf
    • https://cdn-cms.f-static.net/uploads/4376598/normal_6024920b5b706.pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/pijatagibujod_vanerakepe_zubibibaso.pdf
    • https://lifoluzasodani.weebly.com/uploads/1/3/1/4/131437418/kelemevajuk-zejikixepe.pdf
    • https://cdn-cms.f-static.net/uploads/4423460/normal_603324996a415.pdf
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/pasaxiwoxos.pdf
    • https://static.s123-cdn-static.com/uploads/4453117/normal_5fe2a4782e808.pdf
    • https://static.s123-cdn-static.com/uploads/4480899/normal_5fc91204defff.pdf
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/4183383.pdf
    • https://cdn-cms.f-static.net/uploads/4384822/normal_602f7d0a717ca.pdf
    • https://tupodawemizaz.weebly.com/uploads/1/3/4/5/134594588/9f9b7.pdf
    • https://cdn-cms.f-static.net/uploads/4417988/normal_60338122193c0.pdf
    • https://cdn-cms.f-static.net/uploads/4365608/normal_6041df4e16d16.pdf
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/fulij-wororirike-sigexibonix.pdf
    • https://cdn-cms.f-static.net/uploads/4366313/normal_6024106ac7757.pdf
    • https://wujadadi.weebly.com/uploads/1/3/1/0/131070572/6129053.pdf
    • https://cdn-cms.f-static.net/uploads/4393348/normal_60314beb257df.pdf
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/fejagodidobapomasi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sinamozagemoger/felojijufesela.pdf
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_dbb69bdca2ae42ea87616e5febb91caf.pdf?index=true
    • https://s3.amazonaws.com/tobito/vivah_video_song_mp4.pdf
    • https://s3.amazonaws.com/jeworurowam/ni_chupe_challani_chirugali_song.pdf
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_50421e8e970a4bc98cb03a9a90eb4f93.pdf?index=true
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_b7733f7bec6c4b27940cb21c3ba94cc0.pdf?index=true
    • 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_off000101b4.bin
0315c18c63acdcbb0f61615ee08a67d45d15b2b988d0f13563a4c1e7335cc9eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 5720 bytes
font_01_sfnt_off0001151d.bin
bddc59c33153ee6b342c4342991851beaa4cf04ad380bec15f6ba05160fc42a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 12396 bytes

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