Malicious PDF — malware analysis report

Static analysis result for SHA-256 60c020f5b97526f8…

MALICIOUS

PDF

81.9 KB Created: 2021-03-15 22:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0221086b3b4a5dc623bfa593cf521621 SHA-1: 0cdefe24d5179dd90f9e135c0123ffd02dd89594 SHA-256: 60c020f5b97526f8243c90f2b8f9a61f5b39e20551066d6d3c8f61a7dfd42ea3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, many hosted on disposable domains. The primary URL, 'https://jacksth.ru/123?utm_term=strep+pneumoniae+bacteremia+guidelines', suggests a potential lure or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or SEO-based malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jacksth.ru/123?utm_term=strep+pneumoniae+bacteremia+guidelines PDF link annotation
    • https://cdn.sqhk.co/bareziwo/hnQigjf/spiral_ham_instant_pot_pineapple.pdfIn PDF document text
    • http://sokepazetovul.22web.org/how_to_shoot_baby_photos.pdfIn PDF document text
    • https://rosowimibezot.weebly.com/uploads/1/3/5/3/135392622/fifipidewofedev.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/dWhcy1R/1867927272.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/cbse_10_marksheet_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/firavibaw/Xjfjf3d/nalor.pdfIn PDF document text
    • https://vivuguduwidu.weebly.com/uploads/1/3/2/6/132681484/8007732.pdfIn PDF document text
    • https://butijewib.weebly.com/uploads/1/3/4/8/134886415/vunegovutuki.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://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_3804c935511a405d9b047bcf33c14ab5.pdf?index=trueIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_5b04858d9ba84ff9ae1f2850f881fc42.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4bd97e-55b8-4d5f-8d3d-3f3162c03685/pofosagemopu.pdfIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_b0954e918a754830a6466bc4ff3f2669.pdf?index=trueIn PDF document text
    • http://bevoxoxoj.epizy.com/case_in_point_8th_edition.pdfIn PDF document text
    • http://sigukelebejewir.epizy.com/tuwipegup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76782e07-6aac-4949-b4b9-5cc4f77cc311/vegosipebaxujinafis.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_2ea9ee15a35142778f20b6d21d30406e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22037aea-eab1-41f8-b1c2-d145ff6b2983/74573498178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e332e0-5e17-4f09-8fc6-27f45e86746f/xekanevuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79731083-9a8c-4a41-81df-5663d7f21b77/jelobakefaxin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cd6b9e-fb06-4149-9063-390eb5a2a2c2/povijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b9da0f-3eae-446d-8731-2ffa4a9309e4/what_is_the_value_of_a_2006_chevy_equinox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cecf030-dbe7-4dd7-a31b-285719a03506/6637592437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3fd71f1-a0b3-4a29-aefd-5b971fb73499/nenelame.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_129da4ae9de3418f82953d81ad19dc28.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 5516 bytes
SHA-256: 3a100a7286326dcf6916714bd374ffe39533f255bb9d05efee40aa681aa7f62d
font_01_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 10468 bytes
SHA-256: 1c06d7ea9f0cc465ea3a8b3419f4a7f9ed0d72263b8d636aa9c2f14a43091283
font_02_sfnt_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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