Malicious PDF — malware analysis report

Static analysis result for SHA-256 4740d5b40b4ed251…

MALICIOUS

PDF

74.0 KB Created: 2021-03-20 13:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 14cc2d94574cf80bfe3d23f043a0ed9d SHA-1: 48610d7779921945be4e8fd985ff91271203dc5b SHA-256: 4740d5b40b4ed2516463564709ba7d2f2f28e202c68bed0c72b4efdc614621ca
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/wix?keyword=tongariro+national+park+mordor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488135/normal_6018dec039077.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/idKWjgi/radio_online_mexico_rock.pdfIn PDF document text
    • https://ruzikafa.weebly.com/uploads/1/3/0/7/130739156/11a1f1.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/kobirewuwok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_604b14ee04999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_60498941817ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488815/normal_6048337a41c83.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/6hihijh/balenciaga_triple_s_white_black_red.pdfIn PDF document text
    • https://rinuxusopav.weebly.com/uploads/1/3/4/6/134679155/3b18fd6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_abec647aa4ac4b249ad4ad2f78ccb7ff.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_10381fe2e58c4bfeb666fae5994c6c41.pdf?index=trueIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_da56ae590ce542b587f6bde8a941c7d8.pdf?index=trueIn PDF document text
    • http://zaputizovirifo.rf.gd/kasagufud.pdfIn PDF document text
    • http://nadefivetokilak.rf.gd/rorisika.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_e82033b15aa24a64bfebe7e3fbb695ec.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_a1a695e0c6784151812da210e26dc039.pdf?index=trueIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_674c785fe2f246b0a001265cf498cc9b.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_6a67514e7ba64e82994ac55f281d0aa7.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_e3fda30cff994d7a80f0db83858363fb.pdf?index=trueIn PDF document text
    • http://fofeparulofiz.rf.gd/15026986584.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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 5116 bytes
SHA-256: b3561d261aedb542b03c9177003d5ce1e77ca21a74ef42918cf1e73f076aaea3
font_01_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 10224 bytes
SHA-256: dbd9cb90ff03a9ed8bd194e7d830c911b264012b1af936ce9679f8a31d4c312e