Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbe2551b75d186a…

MALICIOUS

PDF

69.4 KB Created: 2020-11-16 19:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d96c53753ec2d987e31ed96350195e80 SHA-1: 5e17d033dbd10b31aabc15dd7cfd1ae70a9255bd SHA-256: 7fbe2551b75d186a54abe0c2d17fab437a206239ccd510781ca113a4e90829a7
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily corrupted, appears to be a lure related to 'high school principal interview questions'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://trafficel.ru/123?utm_term=high+school+principal+interview+questions
    • https://menebunokusup.weebly.com/uploads/1/3/4/5/134588819/9664447.pdf
    • https://jusopusoguwukul.weebly.com/uploads/1/3/4/4/134494455/ladowamavadi-xukujevez.pdf
    • https://zaruvuverabepu.weebly.com/uploads/1/3/4/0/134017911/nonoke-nusafikusop-zekojodowad-gutamumixefiw.pdf
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/xusarawekefimira.pdf
    • https://cdn-cms.f-static.net/uploads/4468843/normal_5fa9d80d73cc9.pdf
    • https://somubafe.weebly.com/uploads/1/3/4/4/134444697/birivuxipi.pdf
    • https://cdn-cms.f-static.net/uploads/4474170/normal_5fa95c42bdaaf.pdf
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/sovelavutibeborig.pdf
    • https://rugazodexozapef.weebly.com/uploads/1/3/4/4/134480570/rejotawesu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e07d017-d271-4f3f-9ac9-c6d411ebfabb/mr_jones_animal_farm_traits.pdf
    • https://s3.amazonaws.com/lodunixodetum/66710058985.pdf
    • https://s3.amazonaws.com/tobojelusiwi/95353241461.pdf
    • https://uploads.strikinglycdn.com/files/8521fa09-bda2-470d-997b-18a4a9233b1a/81628142414.pdf
    • https://uploads.strikinglycdn.com/files/f85f38ed-9e19-4919-b91e-b2a2a827b196/migifudigepixapafimik.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d3.bin
25cc297630b8987f493485302880ecac18932724eb2455ce1233513eab8bb720		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 5432 bytes
font_01_sfnt_off0000e766.bin
ade17a911e57e92262cfb410974d49c32b04ed0aad616421c908b01c77a05701		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 9776 bytes

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