Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb79212e192120f…

MALICIOUS

PDF

85.5 KB Created: 2021-03-16 08:12:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b4b40485f5fe5e4db5a984c5d6ff5fde SHA-1: a10652e4439ec12f79dabe8f44ab451fb06870e3 SHA-256: 7fb79212e192120f053bf780c5a1f4f298a105251c45b6f40a9b70c701b9147b
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 domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

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://midufefew.ru/strik?utm_term=gps+garmin+n%25C3%25BCvi+2589+lmt PDF link annotation
    • http://jofifuneku.medianewsonline.com/difawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_6012d61fa292b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5ff25c8ddcc37.pdfIn PDF document text
    • http://nitafibejuze.mygamesonline.org/33805380087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485310/normal_5fe36880466c3.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/4c2eb60b-7ff7-4edb-afc6-9c8233982c28/how_to_conduct_a_classroom_debate.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/735880118.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/arm_cortex_m0_architecture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce1e131-3b02-4f7c-b7d5-44e322595de8/29205250995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef21c539-1955-4788-a938-c63283c28ba5/mx_player_download_apk_softonic.pdfIn PDF document text
    • https://801a9f91-e12c-4b3a-b535-42c3eaff61c8.filesusr.com/ugd/d237ef_dff005c61a9142849e71b94b3944382f.pdf?index=trueIn PDF document text
    • http://rewuwuja.onlinewebshop.net/zemetitulux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4545f21-45f9-4ab5-bf36-d2b07fe30dd3/13568676006.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_845d9af297c64575abf5c1aa8734c60b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3cf468-fbee-489c-bba0-cd160b521aa3/honda_shadow_1100_carburetor_diaphragm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5abf13f8-7374-4f35-adc4-4fa4561068f7/blues_for_mister_charlie_act_i.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/gs_auto_clicker_mega.pdfIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_d58b941b006a42d58da534bb915d4122.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_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 5956 bytes
SHA-256: 40bbf98aa354f9b963bded8ace8d6adb1631db9b195ed69ba675ded100e95ad6
font_01_sfnt_off000120a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A1 11720 bytes
SHA-256: a0477baf313d5f9943eb02ba84e8ae949e8aedf145b2d0374a3e73d823df6eb0

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