Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9f50b045486d74…

MALICIOUS

PDF

86.0 KB Created: 2021-05-16 05:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 01e5f75e1c7dd782271f1ee1c65189af SHA-1: 1ab3f98f8db5dd9e646465c6f22728c6018aa7c8 SHA-256: 6f9f50b045486d7418316c4152bcb8585b7f95923c67eb016a9d5cf04821a0fa
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=best+diet+chart+for+weight+loss+for+male+in+hindi PDF link annotation
    • https://nuguserofaj.weebly.com/uploads/1/3/0/9/130969707/vetazemovulanazubas.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/783c4ce6d76af.pdfIn PDF document text
    • https://cdn.sqhk.co/gukovafax/bigDAq4/vunupabeniw.pdfIn PDF document text
    • https://cdn.sqhk.co/semoxumid/BOFha43/xarulepaxadaka.pdfIn PDF document text
    • https://bimotozego.weebly.com/uploads/1/3/4/8/134885309/nedat_befoz_figofidudavonoj_bamukamujimejev.pdfIn PDF document text
    • https://bifekanivixu.weebly.com/uploads/1/3/1/4/131408854/zerewadu.pdfIn PDF document text
    • https://cdn.sqhk.co/manowipete/IZhegfs/motilalipabuwugomile.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/jifLZif/othello_game_free_download.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://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_181243400638407faa309786c1b9628e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/240145f8-752d-4b2a-b3ae-904737a53a86/piwaduzuf.pdfIn PDF document text
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_dc6e6a762aa24a2ebd379b0fdec32da1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/amplitude_modulation_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44bf527d-bfe3-4291-a4e8-6397fb00bd4b/present_tense_verb_chart_spanish.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_35d769b8dbd2478b9061ca6fa6f93d7d.pdf?index=trueIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_f1b66d945ed7409fa01ac0ea8588b2ba.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_7bf0ee5b3edf4af6b446f24a121aa241.pdf?index=trueIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_280de9cdc11545a9ad38296c7592846b.pdf?index=trueIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_e72c652f13d14f249c3e6cef067925b3.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_c922583e2db94e0b9fb50f9f999118b4.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_a279a1e1992447c18b4c8d4961139456.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rufonali/anatomi_pembuluh_darah_vena_dan_arteri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf614b1-238b-4908-bc0e-9150efd382e7/73394934378.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/ferasebumewa.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/55401133678.pdfIn PDF document text
    • https://medlineplus.gov/diets.htmlIn 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_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 5364 bytes
SHA-256: 73219eff86c2f0d18d9ffc243d877cd26026ce8dae53538fb0bedbb1a6750637
font_01_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 10792 bytes
SHA-256: 5daaf15e1437f913bd53006703eafec6c5281b088c4656383abe1770d1c0d503
font_02_sfnt_off00013b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176