Malicious PDF — malware analysis report

Static analysis result for SHA-256 791dbf537bb11a3a…

MALICIOUS

PDF

74.7 KB Created: 2021-02-27 08:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b4c75753d823b4a01d6c5b4e88bcc64d SHA-1: 51cbd5b0fc515ecb48f5c9331938c31bcc79ba4e SHA-256: 791dbf537bb11a3a7841882d4947c94e841f4c6478bbe5852fa71411ad6ff773
126 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 domains and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, references 'Hampton bay uc7078t', suggesting a lure related to a product manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=hampton+bay+uc7078t PDF link annotation
    • https://cdn.sqhk.co/belerudoxej/SjjjfO0/62418583472.pdfIn PDF document text
    • https://cdn.sqhk.co/dagorabowixu/i2G6Rot/mad_truck_challenge_racing_apk.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/adobe_photoshop_cs_8.0894kx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_5fd70f54200f7.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/ct6pc0p/nemogetimogemiwuwuz.pdfIn PDF document text
    • http://ndfnasg.xyz/asphalt_xtreme_revdlrwn4c.pdfIn PDF document text
    • http://stroiline74.ru/36018419986ymjgs.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/hbvjhYz/smartword_learn_languages_vocabulary_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/mrCjgwG/12415611014.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sixijoras.epizy.com/tabuda.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/how_to_fix_leaking_washer_drain_hose.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/49230892979.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/fomiwuke.pdfIn PDF document text
    • http://rovofupokunuda.rf.gd/dragon_age_inquisition_character_creation_guide.pdfIn PDF document text
    • http://sebixadasejevu.rf.gd/ravenfield_build_16.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 5392 bytes
SHA-256: 69e6fb304b358f325c24da6ccc3629505f90c3d69f45fc425bf2449bf255b4a1
font_01_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 10632 bytes
SHA-256: 3dc777e09672d0df63f3d079f4943481da3862e4344d0fc7b2dc3ffd954cece3

Open this report in the interactive analyzer, or submit your own file for analysis.