Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc43b035a56e73de…

MALICIOUS

PDF

71.0 KB Created: 2021-02-23 18:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 011ca5facf4605f22c874aae194fa039 SHA-1: 0c90c098e00f1ae1f9ce3a6e5f31486ef8c0a5e1 SHA-256: dc43b035a56e73deba565bc9d677ff17503c4bd640804248b463c100a29494c5
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further compromised sites or download additional malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://yafferge.ru/wix?keyword=dark+souls+2+pyromancy+build+reddit In PDF document text
    • https://mopuvavipobum.weebly.com/uploads/1/3/1/0/131070525/371660.pdfIn PDF document text
    • http://svoydvalend.xyz/rugby_world_cup_2019_tv_coverage_nzra2np.pdfIn PDF document text
    • http://itfamily.pro/18088982032ju932.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/8hgVqRd/batman_the_telltale_series_nintendo_switch_trailer.pdfIn PDF document text
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/keladozedozaja.pdfIn PDF document text
    • https://wivamugetatiwaw.weebly.com/uploads/1/3/1/1/131164202/b551708cc.pdfIn PDF document text
    • http://sugegixojavuro.iblogger.org/26546476352.pdfIn PDF document text
    • https://puralabeno.weebly.com/uploads/1/3/2/8/132814071/392336.pdfIn PDF document text
    • https://cdn.sqhk.co/jisesixerigu/chbHidX/tank_commander_song_battle_of_the_bulge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468828/normal_600d10edeff80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_601ad858e5aea.pdfIn PDF document text
    • http://starconflict-game.ru/informal_email_writing_exercisesz2ybz.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/DuPjdnt/81160499505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_602304f625077.pdfIn PDF document text
    • https://rogebupapopax.weebly.com/uploads/1/3/0/7/130739826/6701446.pdfIn PDF document text
    • https://cdn.sqhk.co/pejozujemu/jhMiif9/todegulozojizapox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasilew.epizy.com/zamokutemil.pdfIn PDF document text
    • http://loxeputogojew.rf.gd/old_newspaper_template.pdfIn PDF document text
    • http://wegudewabeko.rf.gd/latest_audio_naats_2018.pdfIn PDF document text
    • http://bejofidexi.epizy.com/retuliwuwarevadagoz.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_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 5656 bytes
SHA-256: 9ba90fe14e14956b79474f992142449530808caecb1feaee9e29c3cf55a8fa16
font_01_sfnt_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 11016 bytes
SHA-256: 8eb7f38432efe48b0a8c2bce9dee2dc9b3a0c94097ebaac53f63244d5ff63d4c

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