Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44cc77c7e26831e…

MALICIOUS

PDF

80.1 KB Created: 2021-05-09 23:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b05f0ce5a740880bb4c4b525c846d019 SHA-1: cba3444471945eeadd3bc5dca5d23fc9002dcbf0 SHA-256: d44cc77c7e26831e96242cb290670d57971827101891a2c8267ab5950003dfae
146 Risk Score

Malware Insights

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

The PDF contains embedded URLs and a malformed stream, indicating malicious intent. The document body, though heavily obfuscated, appears to be a lure related to product searches. The presence of multiple unknown and potentially malicious URLs suggests this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://kuzutuzo.ru/strik?utm_term=where+to+buy+a+timex+watch+near+me PDF link annotation
    • http://laribij.scienceontheweb.net/18188382774.pdfIn PDF document text
    • http://skout.tech/mcafee_antivirus_free_90_dayswdk1k.pdfIn PDF document text
    • http://help-service-support.com/sensus_water_meter_how_to_openf53sn.pdfIn PDF document text
    • http://idealica-uficiale.website/up_anganwadi_bharti_online_form55pl8.pdfIn PDF document text
    • http://requiremcgood.com/1454722827gedqj.pdfIn PDF document text
    • http://lifeeuro.info/geometry_vocabulary_worksheet_freelnpqi.pdfIn PDF document text
    • http://ehaberdevlet.com/zazaneguzatevavajitijowj.pdfIn PDF document text
    • http://kinorio5.xyz/gesobis1q2.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/carbon_black_edr.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/kulinisokakewi/troy_bilt_21_inch_self_propelled_lawn_mower_parts.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/algorithme_et_programmation_langage_c.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_d21dbe2415a341379ec8c55536b47934.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajixe/ancients_paladin_5e_guide.pdfIn PDF document text
    • http://mugomodag.atwebpages.com/16740443781.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_1d69c247798a4d6d9c001ca81db84ee8.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 5244 bytes
SHA-256: 73212b7d1b4a43830fdece0599433bd56476c5d644885102936c77205012d9a8
font_01_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 11180 bytes
SHA-256: 9c4f12c0b2a823e6464820be7f5eaca77b5aabea44f5e07803d75df998cf97da

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