Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52420e070a29e4b…

MALICIOUS

PDF

75.5 KB Created: 2021-04-24 00:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9d6e1b0ddf90167c24747fddfab9a90d SHA-1: a0944a57ef114b62fd89f24ae39e014d2076ac84 SHA-256: d52420e070a29e4b58065fde2acb3b719cebcd864229e68dd085dd193fa8d224
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to 'Cummins onan microquiet 4000 parts', likely a lure to attract users searching for specific technical information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/strik?utm_term=cummins+onan+microquiet+4000+parts PDF link annotation
    • https://gasulemuj.weebly.com/uploads/1/3/4/3/134352818/rumupikosi_xebituwi.pdfIn PDF document text
    • https://fosarujup.weebly.com/uploads/1/3/4/6/134624161/9290552.pdfIn PDF document text
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/0d74fa063c8.pdfIn PDF document text
    • http://zavivobatiwiga.22web.org/nelson_s_pediatric_antimicrobial_therapy_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_6023b865b6ee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_600eaffec0cda.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/boloxazaru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377125/normal_5fe56e42061a9.pdfIn PDF document text
    • http://kifepivukog.iblogger.org/littleroot_town_guitar_sheet_music.pdfIn PDF document text
    • http://xewaxoweva.22web.org/death_star_bluetooth_speaker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5fdc17b9e0e73.pdfIn PDF document text
    • https://nuribivavis.weebly.com/uploads/1/3/4/6/134625990/23f75214a5711.pdfIn PDF document text
    • https://gadabuji.weebly.com/uploads/1/3/4/7/134715747/1932964.pdfIn PDF document text
    • https://miletotafog.weebly.com/uploads/1/3/4/7/134758503/52db1e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najepesirezamuz.rf.gd/good_morning_photo_whatsapp_gif.pdfIn PDF document text
    • http://vovijez.epizy.com/candy_crush_pc_windows_7.pdfIn PDF document text
    • http://rixuzomobe.epizy.com/choose_v3_form.pdfIn PDF document text
    • http://jusibutotesax.epizy.com/ant_colony_optimization_in_matlab.pdfIn PDF document text
    • http://lasiratiguguro.rf.gd/74791007085.pdfIn PDF document text
    • http://sizurixujiboxen.rf.gd/casey_at_the_bat_answer_key.pdfIn PDF document text
    • http://xonukekavufimil.epizy.com/rarilir.pdfIn PDF document text
    • http://vefovax.rf.gd/platform_film_ka_gana_dijiye.pdfIn PDF document text
    • http://dunupilopun.epizy.com/marshall_mg100hdfx_half_stack.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_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 5308 bytes
SHA-256: 4c8244f41c4df3b118d06b98c5ec48387fe6e917cd893e675fc63782341e70d0
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 11240 bytes
SHA-256: ec8e7dd9abfa3da4c903a391592ad5833599da3cb2b08cb56b403aebe3a231b9