Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0727304c2432109…

MALICIOUS

PDF

103.9 KB Created: 2021-03-18 14:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4548811827a2456a8393d498b388f55b SHA-1: b0140cff9f7f023f7f8fd67426c4926397d8a777 SHA-256: a0727304c2432109b2a1196a5ee5bf51de1f10d596e28718037d49e5c1d36be0
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://vilenefex.ru/strik?utm_term=what+is+orientation+straight+means PDF link annotation
    • https://jejomedilad.weebly.com/uploads/1/3/5/3/135316302/3662273.pdfIn PDF document text
    • http://loveworld.club/164994743296tp1e.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/eMwPhaz/53463726070.pdfIn PDF document text
    • https://tipurovus.weebly.com/uploads/1/3/2/7/132741110/liwubesivakoze.pdfIn PDF document text
    • https://fapudunaga.weebly.com/uploads/1/3/0/7/130776769/5213810.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/wivomadezadanivinojt6c04.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/7c40791340d.pdfIn PDF document text
    • https://figowemepiwe.weebly.com/uploads/1/3/1/3/131398533/vojuposabagi.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/7298302.pdfIn PDF document text
    • https://mogiwojijefinan.weebly.com/uploads/1/3/4/9/134900510/buxejugufojika_satimisopipus.pdfIn PDF document text
    • https://cdn.sqhk.co/donalujepimo/hiafgc7/stress_management_activities_for_high_school_students.pdfIn PDF document text
    • http://com-login8.xyz/salikizuyj2lr.pdfIn PDF document text
    • https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/kisorogasakitum-dokafomexutu-naxemorowagim-rivogekuzuvoje.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/zonubaf.pdfIn PDF document text
    • https://dabomisefeb.weebly.com/uploads/1/3/0/7/130775205/mizexegisidir.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/d2708b2d-77fe-4f55-8f37-7ce1eb0e7b03/77023771690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84d176a-aebe-4a27-a93c-047115a00da2/verizon_wifi_modem_setup.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_off00014202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14202 5080 bytes
SHA-256: a492c1543547f05dcf3cc7edd7383e12d74f3418442b56dfbc9c91b60292f0c4
font_01_sfnt_off0001532e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532E 12760 bytes
SHA-256: e23d5face131acbf98647096d7d47a2f25269de5f4b5f73144ceb57af68733bc
font_02_sfnt_off00017da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA4 16296 bytes
SHA-256: 1035a9322cb4d7a45ed5704cd3b86179ec193f9447d8729832bbe7a86d55d187