Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e4a5572b60aee6…

MALICIOUS

PDF

91.2 KB Created: 2021-04-09 04:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a98b59dff84455ce093ff7f6b39096dd SHA-1: 788944283ae3b0f9b5ac2a923bf62ada0fad1186 SHA-256: 03e4a5572b60aee6c88951ded6ecf1e1fc2124516fed303e0d65e600f46cca38
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, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=mossberg+500+ag+manual+disassemble PDF link annotation
    • https://cdn.sqhk.co/zezinojox/gfCqjaF/cramped_ness_traduzione.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474722/normal_6014023327973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444353/normal_60593954402fd.pdfIn PDF document text
    • http://fridgeservice.ru/acids_salts_and_basesjox74.pdfIn PDF document text
    • http://mishgen.com/gegoditopovexikakulifc6ckb.pdfIn PDF document text
    • http://50offit.pro/how_to_remove_water_from_lg_top_load_washing_machinedvm2k.pdfIn PDF document text
    • http://in-arenas.com/6342116005dsbpp.pdfIn PDF document text
    • http://nikaold.site/nepinenagidefepukea7zy.pdfIn PDF document text
    • https://cdn.sqhk.co/kilalovuge/jgjgUhi/wejejeparovobib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403563/normal_5ff49f32ce627.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/how_long_is_ccna_valid0xicx.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/heehajg/free_casino_slot_games_with_bonus_for_fun.pdfIn PDF document text
    • http://bonifacy.site/bovogejagijef3zump.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_146300ef2e464c04b3fcc3a4895e05f3.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_4b14b6486ce540d49eec0e31d9515be6.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_5f745cc86b8c4a2aa0f242a81b7261d4.pdf?index=trueIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_59aa55cc7f29417ba9713be764fb0461.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_280ede503f1c403eb3db3458d6c2fc0c.pdf?index=trueIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_77ac1f04e7ab4b438e05fbaa78ee7396.pdf?index=trueIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_8414bfeac6da4e83816f2ebeb08fb750.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_affc1bca4b7940dd8501f134a92603ef.pdf?index=trueIn 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_off0001248d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248D 5556 bytes
SHA-256: 9a7cee7e9329378920b9f6d810c126a94a778f8abd5065d8e4095c634ea67850
font_01_sfnt_off00013763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13763 11788 bytes
SHA-256: 3e251a139ff18f9cac44e6efeef9d1e96b65f489105182308f8096bb738c9b20