Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d41c047c897211…

MALICIOUS

PDF

74.3 KB Created: 2021-06-01 13:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fec253c68b9e32005f12079e6811a160 SHA-1: 310b6d00878ade5e5d2b9f43e58ff447132de718 SHA-256: a7d41c047c8972110b57a544beae87ae9a29125520f6988fe97b82430bb3965a
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, indicating a link farm or redirection scheme. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The embedded URLs suggest an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/pbw?utm_term=battlefield+2+revive+project PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4378379/normal_60b303c319b03.pdfIn PDF document text
    • https://zatajiwivovib.weebly.com/uploads/1/3/4/5/134529671/pelav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fd711ce3baff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448746/normal_5fcd381e1c787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_60595f84bae03.pdfIn PDF document text
    • https://wijimoki.weebly.com/uploads/1/3/4/4/134485243/miwapatijibidoro.pdfIn PDF document text
    • https://botironuz.weebly.com/uploads/1/3/1/3/131380999/xotutirox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf01b7a-4d77-42b6-b6ab-5fe0671db253/are_scales_that_measure_body_fat_accurate_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69338482-7a6c-4790-b45e-97f38a56c39c/663932926.pdfIn PDF document text
    • http://bepisoxu.pbworks.com/w/file/fetch/144440091/simple_business_lease_agreement_template_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66fe705a-315f-4c8a-8a73-fbf4b5800860/snapper_ninja_lawn_mower_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8e59978-c282-4eec-b0bb-8dfd604c0775/ruqyah_shariah_mp3_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f900cbc7-b34f-47ff-81b9-3e824a1048b8/pozivapawusiveku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec5d48b-819e-4982-8e57-74a193b34e49/how_much_does_a_doctor_earn_in_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d40f3e-79bd-4f56-8367-94a59f70a3c9/spending_a_lifetime_with_you_quotes.pdfIn PDF document text
    • http://pokatufaxi.pbworks.com/f/bebodojares.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/tekken_blood_vengeance_2011_bluray_1080p_download.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_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 5288 bytes
SHA-256: e64479436c0b7c0faf2d87b268fc2f699dcc8fd511d52bbc9ef5922b0436cd23
font_01_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 10476 bytes
SHA-256: ec07c6eeb3044be1d7f189681490ac6e388c94317532164ebd39c213054a8294

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