Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1b6935b141503a…

MALICIOUS

PDF

83.6 KB Created: 2021-05-17 00:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d24905c4e51a0c4591b783e3a966c694 SHA-1: 7fd986585a96b431284887d6487350aa6420e6df SHA-256: 8c1b6935b141503af96f892caffb9553dd66adeef38d8f376ff629faed5b16c1
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content. The presence of a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing further supports this, identifying a link to known malicious infrastructure. While no scripts were extracted, the structure and heuristics strongly suggest the PDF is intended to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=herb+ellis+jazz+guitar+method+swing+blues+pdf In PDF document text
    • https://cdn.sqhk.co/risubibasero/Ic5jggf/rafidana.pdfIn PDF document text
    • http://rat-red.space/785270352502v8hk.pdfIn PDF document text
    • http://meetcabinets.xyz/lifokimogodijeo01kg.pdfIn PDF document text
    • https://denosuzasagi.weebly.com/uploads/1/3/2/7/132712615/fiseso.pdfIn PDF document text
    • https://tidijutaxidekoz.weebly.com/uploads/1/3/4/5/134589823/xajawevozemutejig.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/eihUUhf/84743964834.pdfIn PDF document text
    • http://disconto50.pro/samsung_galaxy_s5_price_in_pakistan_second_handj554j.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
    • http://rigitusavogu.epizy.com/logic_of_english_spelling_rules.pdfIn PDF document text
    • http://gedifigo.epizy.com/sobutedubo.pdfIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_eda367627415406ba9e05687c7f185d6.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_2a672ae42d7f4695961cab16bc1d57d7.pdf?index=trueIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_f05d2e1d2cf7471a9d3bcc600312fec2.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_81a4ed1ef5c14e96bd3fe8543fe1bf45.pdf?index=trueIn PDF document text
    • https://84bc2af4-305a-40b7-847c-8c52cb6b08d2.filesusr.com/ugd/a2e525_b72106c64ade4dacb68a56c5bf07c223.pdf?index=trueIn PDF document text
    • http://fosisidevafepet.epizy.com/sifejokij.pdfIn PDF document text
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_281af779d27345048b64df50c0bb9a6a.pdf?index=trueIn PDF document text
    • http://noxisalezupob.epizy.com/sunnyvale_vw_service_coupons.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_395ef22c6b114776bc3dd9756985c87f.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_ac0a656ed6304726a9df1bef1b453807.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_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 5656 bytes
SHA-256: c128d72c3e6bec82f03f6a1ebd6776a15bd1e0cedd291ffd71722d4cdbb371c1
font_01_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 11752 bytes
SHA-256: bbc78f373f67eb6a106f67bfd4ff6e0fda3fa5bdfb2a497220ffba0bc0c61838
font_02_sfnt_off000130fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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