Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fae525189b1448…

MALICIOUS

PDF

66.1 KB Created: 2021-02-16 06:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 15e50c473728cebd9313c482c1aae514 SHA-1: 40c211a9233bb1126865b6b07aa6637af1ec2df4 SHA-256: 76fae525189b1448ccc2cb47a9e2b6f0f76116125251064329ecdb41d55c1454
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO abuse. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://seumenha.ru/123?utm_term=stihl+weed+eater+carburetor+fs+56+rc PDF link annotation
    • http://privateguardingserviceagainstdanger.site/astenia_y_adinamia_definicion265au.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/4124100.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/aUjG3so/cbs_full_episodes_live_tv_itunes.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajura/dibjf7p/create_empty_list_in_java_8.pdfIn PDF document text
    • http://barekokodigak.iblogger.org/54420039595.pdfIn PDF document text
    • http://sushibara.net/45008155697qk9b0.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/hc6jgjg/61946967628.pdfIn PDF document text
    • https://lurusavi.weebly.com/uploads/1/3/2/7/132710630/julub.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/8jfzghi/pulabosisotipiwos.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/gjDhfzS/64153264676.pdfIn PDF document text
    • http://tricitysikhs.com/60938157985tifnr.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/ghjfehg/free_printable_grade_2_math_games.pdfIn PDF document text
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/2859755.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/lijligd/empire_z_endless_war_cheats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/going_to_the_chapel_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/bukozakozogu.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/59975857914.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_off0000c260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC260 5724 bytes
SHA-256: d4125b863d4ab7aadf04aec1e3d0baf24ed49ae81bcf1f795a339878fd72da39
font_01_sfnt_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 10504 bytes
SHA-256: 7da6665cac008755ef4c9004b1d3d5f3e69ad68e6cd0cb6e4e6db58dc7e798ad

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