Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2f4dcee7398209…

MALICIOUS

PDF

93.0 KB Created: 2021-03-20 12:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1f2aca061b3a233ca6d93662d272eb35 SHA-1: fbf7dcf9a19181dc7c608bdd4b54e09715e438ac SHA-256: fb2f4dcee739820977a2cf5de69528b5be62d3c9695b93a6e57ae36ea4222eec
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 hosted on disposable domains, characteristic of a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it acts as a downloader or redirector to malicious content.

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://seumenha.ru/strik?utm_term=how+to+read+variance+inflation+factors+results PDF link annotation
    • https://cdn.sqhk.co/xanikadir/iDigQhi/download_mod_farm_frenzy_inc.pdfIn PDF document text
    • https://towodoruzaxigol.weebly.com/uploads/1/3/6/0/136050186/zepomitos.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/gejifajadesa.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/fPd9YAU/find_my_friends_apple_watch_location.pdfIn PDF document text
    • http://formulamoney.top/9304224012mbkfr.pdfIn PDF document text
    • http://pinerapidsrr.com/a_levels_chemistry_periodic_tableik02f.pdfIn PDF document text
    • https://figowemepiwe.weebly.com/uploads/1/3/1/3/131398533/bonerenajovumulot.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/gfjge7h/luke_combs_new_song_does_to_me_lyrics.pdfIn PDF document text
    • https://zedetebi.weebly.com/uploads/1/3/1/0/131070456/7688511.pdfIn PDF document text
    • https://baxorumele.weebly.com/uploads/1/3/0/9/130969728/9909237.pdfIn PDF document text
    • http://imedo.ru/jawbone_up_pricetlyab.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/zejidalegim-doxegaxi-bevadibudev.pdfIn PDF document text
    • https://temavemata.weebly.com/uploads/1/3/4/6/134611183/5b8d0ec.pdfIn PDF document text
    • https://vugopese.weebly.com/uploads/1/3/0/7/130739154/xokenel-wevovoxobuke-gemomureporoxa.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/ca3df68a-de85-4248-b02d-f20a6c7cc4ef/81223521836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379d54e2-841f-4ab4-be7e-5a67496191b5/how_to_populate_a_word_form_from_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/lord_i_need_you_quotes_tumblr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7140fab5-ad8e-4a8e-84e9-89d706617760/safety_razor_vs_straight_razor_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/facebook_marketing_strategy_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 5012 bytes
SHA-256: fac734010631317153073c008f34c64b07bcfd406ff19019313e9c548d9a169d
font_01_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 12880 bytes
SHA-256: c248e403b63b74656c75f7e0fdb518ea87f7747b1928a0b7f5bb1df60d993dd9
font_02_sfnt_off000142a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A3 16200 bytes
SHA-256: 60e7289b9568608fa255407277e991066dacd7143cdb71a5d4f44d0a87f95d28
font_03_sfnt_off000157df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e