Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b54f57a1991e73…

MALICIOUS

PDF

81.7 KB Created: 2021-04-06 20:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 503f4fedc8f92e3b109d9afa23a5833b SHA-1: bfbbd2795f6ebb311449bfcaba6f1b6bb575ece3 SHA-256: 36b54f57a1991e7399cdf6f262f7db2cf6e40424bde18ff85a28598c72f4ed57
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one suspicious URL pointing to 'nipisod.ru', suggesting a link farm or phishing attempt. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=cities+skylines+traffic+president+guide
    • https://static.s123-cdn-static.com/uploads/4445333/normal_5fccb8c400292.pdf
    • https://static.s123-cdn-static.com/uploads/4452618/normal_5fedaa42ef769.pdf
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/8b2c5252763700.pdf
    • https://cdn-cms.f-static.net/uploads/4422180/normal_60137846341e0.pdf
    • https://wuzitefagoxu.weebly.com/uploads/1/3/1/8/131856046/pikufakubuvuku_fijefibi_jurilonowe_rizanozipi.pdf
    • https://static.s123-cdn-static.com/uploads/4497109/normal_60050ce480313.pdf
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/depif-lijasinigalix-repipobu.pdf
    • https://semototip.weebly.com/uploads/1/3/5/3/135386148/1871182.pdf
    • https://rufibomorogad.weebly.com/uploads/1/3/4/5/134505720/3909051.pdf
    • https://cdn-cms.f-static.net/uploads/4465705/normal_606c439a52345.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_1c53af0996a14f61936fc38000181874.pdf?index=true
    • https://s3.amazonaws.com/tokafanawa/hi_point_model_c9_9mm_luger_ammo.pdf
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_f259e823b67b4123b937cbb8bfc09dae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/662e47e2-cc36-4b7c-ad85-3394bc97b4e9/74540672522.pdf
    • https://uploads.strikinglycdn.com/files/0054951c-5e01-47d6-a53d-33833f90a67f/google_translate_english_to_bengali_software_free_download_for_windows_7.pdf
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_ade7eca539424deeaf64748cb269c0a9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/225fd352-b520-4729-b14c-7b9f7c9a527d/1979987560.pdf
    • https://s3.amazonaws.com/bulozor/93251771615.pdf
    • https://uploads.strikinglycdn.com/files/1ec37d47-c461-4afc-9918-5cf92ad5cdec/vizio_model_e550i-b2_price.pdf
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_696f7bbaa23743beaecd3313b54f6c10.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d490dd7b-fd7f-4395-ae4c-559bc3921973/bojogajipesir.pdf
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_3370934df8bf4103b30aaed1b41c0e54.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1b94da8-7176-4979-abf6-773beae76402/reglas_del_juego_adivina_quin_soy.pdf
    • https://uploads.strikinglycdn.com/files/9ff507c6-d000-437c-b7f5-095eb6c39f9f/wofajemululefowabuvibaki.pdf
    • https://s3.amazonaws.com/zuvovoxigumuz/how_to_clean_ninja_blender_blades.pdf
    • https://s3.amazonaws.com/jezekemunidup/wow_vanilla_blacksmith_leveling_guide.pdf
    • https://uploads.strikinglycdn.com/files/4c0e6b1b-1171-4ca2-a308-bb16ff5fb9b8/45970887337.pdf
    • https://uploads.strikinglycdn.com/files/b2cfd5d2-c72a-4746-b93b-4499e9b24dc2/fodika.pdf
    • https://s3.amazonaws.com/zomuzigo/77349288683.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_off0000ff2e.bin
33443a0b3ad2e1b776623612fffe71bbe10fdbc8ca6adfb334327a97d2aa2eb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 5396 bytes
font_01_sfnt_off000111a6.bin
b92bee137dc5396c153499b15d137e4e839cadf29b7c488cd20c2f27184eeb04
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 12008 bytes