Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30326c0391cfd90…

MALICIOUS

PDF

77.7 KB Created: 2021-04-22 17:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c04684d015e19ff690fa90928d7d3d8c SHA-1: b26d495c67333490b14ecc7502660a852615214a SHA-256: f30326c0391cfd9096642f7e108226d8abcc649eafb4b0c58da86356ec29631b
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 to PDF files with numeric slugs, indicating a link farm or SEO spamming operation. One of the primary links, disguised as a search result, leads to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/strik?utm_term=how+do+i+cook+3+cups+of+rice PDF link annotation
    • http://usacreditreport.info/710628971425w3ln.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/gggif5S/suximisadefomufivusisoka.pdfIn PDF document text
    • http://quinzsy-studio.design/julebabatevozikuderomog9o63z.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/redulejorijaduxilixuxidiboden.pdfIn PDF document text
    • http://datab.vip/dofejebazamazabogoboki70ays.pdfIn PDF document text
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/biwaxofowugavasolu.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/bibEghP/tigeget.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/aZma4GJ/98402367079.pdfIn PDF document text
    • http://optalpha.com/jotovugejenuwuzqopcj.pdfIn PDF document text
    • https://zoxitujiwa.weebly.com/uploads/1/3/2/3/132302939/9892067.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/ogejfJG/ghosts_of_mars_soundtrack_download.pdfIn PDF document text
    • http://m-ryanaf.site/45049763713v3540.pdfIn PDF document text
    • http://imkl-checker.com/whats_the_most_important_line_of_latitude_calledgh3v2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/introduction_to_biology_o_level_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/la_bambola_assassina_3_ita.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/xuvimob.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/android_tv_fr_raspberry_pi_3.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/graco_pack_n_play_bassinet_weight_limit.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/how_did_the_constitution_change_america.pdfIn PDF document text
    • http://zodiripek.myartsonline.com/bujoziranutum.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_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 5188 bytes
SHA-256: a9cff9840b6cbc87dafcb5b60612c0862d137153ab5c89370c764f9cdb9b8c77
font_01_sfnt_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 11096 bytes
SHA-256: 2efe22159d571b04263d499c5d07987be54ecec385e162c8e6dcde6f2f25e44f

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