Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3be5c8643cab57…

MALICIOUS

PDF

70.4 KB Created: 2021-02-15 07:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ec7037982fd2411f04e234b030898a68 SHA-1: 769f20c301637249c617fc7c6bc695028c59a70f SHA-256: 1d3be5c8643cab57d53f7dc7274cd8dba761f8aa004edd3e8759b54ee810b4ac
186 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for SEO spam and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://maypoin.ru/wb?keyword=bejeweled%20game%20free PDF link annotation
    • http://prostotit.site/outlander_season_1_episode_13u8tjx.pdfIn PDF document text
    • http://magnetfix.store/how_to_find_parkour_races_on_gta_50d4d2.pdfIn PDF document text
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/64bc5c0d9401654.pdfIn PDF document text
    • https://zegemukugemilut.weebly.com/uploads/1/3/4/7/134707242/e7aff34d67.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/Bhfhhji/snowden_movie_netflix_australia.pdfIn PDF document text
    • http://hookup153.online/bksb_maths_fs_initial_assessment_answerssz2g6.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/hcjhhfZ/zavovexaxa.pdfIn PDF document text
    • https://gibiboxovozigux.weebly.com/uploads/1/3/4/7/134722082/fepon_padote_pekis_rurobako.pdfIn PDF document text
    • https://buporinedo.weebly.com/uploads/1/3/4/0/134041533/868680c2ea.pdfIn PDF document text
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/bibetuben.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/xhfSgZ1/vomelixaguzanabilanaxigi.pdfIn PDF document text
    • https://jadomurujamum.weebly.com/uploads/1/3/5/3/135326923/dovemasasogevi.pdfIn PDF document text
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/vufifuvaforukegetev.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/FGrhevC/entrepreneurship_online_courses_stanford.pdfIn PDF document text
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/wivavexotiteke-mubirufobudijug.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/7196b2cfc.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/5DSF1g6/guxunu.pdfIn PDF document text
    • https://figalinob.weebly.com/uploads/1/3/1/8/131871825/jilopurube.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/8662995.pdfIn PDF document text
    • http://kihepc.xyz/camberwell_assessment_of_need_manual30kog.pdfIn PDF document text
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/limivukaxora_juxitan_vagapilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 5264 bytes
SHA-256: 12f727d07c1dd5fece8edb215c28154fc4c7516dc1b8cedfd55803832be54d6a
font_01_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 10716 bytes
SHA-256: d00f1589f594a3b9b82911316531df8f9651e37387a47d5f3d2e01353759a39a