Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a17a4465e98db54…

MALICIOUS

PDF

103.6 KB Created: 2021-06-05 22:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 85f463f0d695f19132b57bdb9d0fbf53 SHA-1: 0488230d1b7a2af1c9134233f1d5104a3e257216 SHA-256: 3a17a4465e98db54b43f84d726d2d395e382f069e6c680e2c9951b97f1ebe83e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL and the document body's reference to 'ammonia chemical equation formation' are likely lures to direct users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/123?utm_term=ammonia+chemical+equation+formation PDF link annotation
    • https://tiwenevudadag.weebly.com/uploads/1/3/4/7/134715745/xexunaz.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/guvafufuzabisa.pdfIn PDF document text
    • https://kelodulelonax.weebly.com/uploads/1/3/4/6/134644310/mivarusivadib_movibavogudum.pdfIn PDF document text
    • https://gagufivelorifig.weebly.com/uploads/1/3/4/5/134596616/6cb2c5.pdfIn PDF document text
    • https://dibovasejul.weebly.com/uploads/1/3/1/0/131070518/74985f2.pdfIn PDF document text
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/9a8b66f.pdfIn PDF document text
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/gonejazituzuga-sosurev.pdfIn PDF document text
    • https://bawufavipefal.weebly.com/uploads/1/3/0/7/130740211/xofeteziluba_xutivobunazu_sofetux.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/1781950.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/7cc34b1.pdfIn PDF document text
    • https://jixeneneme.weebly.com/uploads/1/3/4/0/134096386/pufinitafenibadobeb.pdfIn PDF document text
    • https://pezilesuwubev.weebly.com/uploads/1/3/4/6/134639222/2736007.pdfIn PDF document text
    • https://rewodudifizaba.weebly.com/uploads/1/3/4/4/134475466/fukolifipivinerufu.pdfIn PDF document text
    • https://gidedumewulo.weebly.com/uploads/1/3/5/9/135961218/belefedatebato.pdfIn PDF document text
    • https://sawatulaboror.weebly.com/uploads/1/3/2/7/132710797/9297264.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/edb1ea3d-925c-4544-adb7-101aa5330796/cloudy_with_achance_of_meatballs_2_barb_voice.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/f/pokemon_white_2_rom_no_anti_piracy_patch.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144452049/kapazowebix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d34a024-b3a5-4482-b1eb-d7271a652573/tetokejawokefitoxakatejo.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144462732/t_shirt_template_mockup_psd_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035a51db-737c-4257-bf35-d3dd856ada70/sudivuwus.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_off000139c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C1 5060 bytes
SHA-256: eb916a304cbef7024a72ab8828b3131182817516ad2c7194f7b72534142e63e8
font_01_sfnt_off00014ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACE 13620 bytes
SHA-256: 157f273c60b17d437a985e52f2ab3b3dcf5580002c035aa17377c2cfe69e0fae
font_02_sfnt_off00017935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17935 16276 bytes
SHA-256: 3b6b1199149085cad8cb9aacb73e7d5482e91963518dc2a4174fbe8839b77a98