Malicious PDF — malware analysis report

Static analysis result for SHA-256 7993e4fabea69fcb…

MALICIOUS

PDF

82.9 KB Created: 2021-06-11 11:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cebc8683343ef82039bfffe827d5ba6b SHA-1: 6a6a5f67347648659bfcb86ed631d53ceb97b770 SHA-256: 7993e4fabea69fcb1d9c7ad2c71e848ecdfd3fd5531f9f59170c6558bf90ddd2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and uses a 'utm_term' parameter suggesting a marketing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/pbw?utm_term=forest+hills+drive+mp3+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5fde8c4a20c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_603669cd4c0d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422150/normal_605598000a512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_605fe3921eff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453556/normal_606667255bac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478703/normal_605c6ac850eda.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/7857375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5fce79359b0be.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4374196/normal_60aff72982d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_601d016a7266a.pdfIn PDF document text
    • https://sopulekazixov.weebly.com/uploads/1/3/0/7/130776801/vivodiwi_sojulev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449974/normal_5fe38f234e0b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_6022845ac0cf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_60303e28215b2.pdfIn PDF document text
    • https://fodumalape.weebly.com/uploads/1/3/2/6/132695584/d5738609e6939f.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/28cadaaf-febe-4d35-9e7c-793f468fcad6/how_to_clean_coffee_maker_black_and_decker.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/f/88666742582.pdfIn PDF document text
    • http://kimiwodevus.pbworks.com/w/file/fetch/145092981/mp4_to_dvd_converter_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f304892e-7680-4f6f-82b3-b2ce89c20508/52104442519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742f4fb3-18c0-4fd1-bca5-fbf8bcf921e0/2007_jeep_grand_cherokee_srt8_price.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/open_sim_card_tray_iphone_xr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc81a14b-5e44-4480-a8dd-e83b4a93242c/how_to_install_imagenomic_portraiture_in_photoshop_cs6.pdfIn PDF document text
    • http://ganosidil.pbworks.com/w/file/fetch/145117524/borat_english_subtitles_full_movie.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 5468 bytes
SHA-256: fa449fa615101321e93111a731b78f2acf463b0997dc8f70555f3222833aaa09
font_01_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 12024 bytes
SHA-256: acc31c1ce6902fb668b2732860d10b37bd939db173091f26000b5ebc33463a93
font_02_sfnt_off000128a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A5 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf