Malicious PDF — malware analysis report

Static analysis result for SHA-256 6427296d4b5526c1…

MALICIOUS

PDF

82.3 KB Created: 2021-03-12 01:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ada2b0b7c613fd0fd5ae95dc7d815ae7 SHA-1: e19a4426a841ba88df24535443d0f5fb3c0e3698 SHA-256: 6427296d4b5526c14200e8500ae6854909442771ef4e8d185a3f98766ac88307
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=report+r+squared+or+adjusted+r+squared PDF link annotation
    • https://gipebikurowa.weebly.com/uploads/1/3/4/0/134095939/c3b0b4f5017403.pdfIn PDF document text
    • https://cdn.sqhk.co/ratobomebal/bJJPieB/hangouts_chrome_extension_font_size.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/84Zhegh/51121410562.pdfIn PDF document text
    • https://wokozizexufam.weebly.com/uploads/1/3/4/2/134234926/rezonaponolesiribe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484632/normal_5ff588522d3d3.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/gfjgzgi/jikadawakajixoxotuz.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/ac2aa2b429108.pdfIn PDF document text
    • https://cdn.sqhk.co/poladejug/ghJTbyo/top_10_young_players_fifa_20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414335/normal_5fd06fec90ef0.pdfIn PDF document text
    • https://pisixaxonazav.weebly.com/uploads/1/3/5/3/135394173/1862481.pdfIn PDF document text
    • https://dojosijodutater.weebly.com/uploads/1/3/6/0/136050104/rinotolejiga-zofuxu-kivagusix-pasanezipurufav.pdfIn PDF document text
    • https://wevenakexeg.weebly.com/uploads/1/3/1/4/131438808/pixukewumavub_poselapemod_tawoxudasome_rewabebedazude.pdfIn PDF document text
    • https://fuwelobuzade.weebly.com/uploads/1/3/4/6/134649994/4517976.pdfIn PDF document text
    • https://ruxiwinovisas.weebly.com/uploads/1/3/5/3/135313790/wirokam.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/dudamagutogavowanapa.pdfIn PDF document text
    • https://cdn.sqhk.co/godidudawat/hiwiejc/margaritas_mexican_restaurant_conroe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367925/normal_6002f98d5bab8.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/fubep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422906/normal_5ff8c4ac868e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8c6b9e54-51c9-4c2a-8eb0-82ab34484fb1/fevukimaluganejafemosud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff70fa8f-3c57-4ac4-af3e-b69518d1c859/john_deere_lawn_mower_parts_amazon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 4860 bytes
SHA-256: f56cd19c14533c9aa8698b74fde76e9392eecffa90ca8b76c54188cade5bb28b
font_01_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 10904 bytes
SHA-256: a13115eae24c8449db7ea90d1f45469bffa5f232ec2ca3655308c5e227357d06
font_02_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34