Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1253c337dce3e3b…

MALICIOUS

PDF

67.6 KB Created: 2020-11-21 07:18:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c487387bd367bcd68fadd5444ecb8c6 SHA-1: 11f859f9c4b67ab64a86a313a8a21feeaede9ed9 SHA-256: f1253c337dce3e3b153f9fe1c094bf5ea95b4e23fd58695dd6176b600bc0f41b
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external links, including one to 'traffine.ru', suggests a link farm or phishing attempt disguised as a repair manual. Although no scripts were extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://traffine.ru/123?utm_term=bosch+dryer+repair+manual
    • https://cdn-cms.f-static.net/uploads/4456699/normal_5fb54987a2c9f.pdf
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/bobatubikujabo.pdf
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f8e91957eda9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5ba7ab37-1db4-4974-a3fb-4100ab78acb9/bootstrap_studio_themes_free.pdf
    • https://uploads.strikinglycdn.com/files/b62b00a1-2793-44a0-b7a4-eadbee5e94c0/poptropica_time_tangled_golden_vase.pdf
    • https://uploads.strikinglycdn.com/files/b809205f-32ec-4ea5-8fbd-5f13ba180a64/38195819715.pdf
    • https://s3.amazonaws.com/kubafezin/explaining_quotes_templates.pdf
    • https://s3.amazonaws.com/wefadep/problem_tree_analysis_template_ppt.pdf
    • https://s3.amazonaws.com/fejakixoweka/the_impossible_quiz_question_62_answer.pdf
    • https://uploads.strikinglycdn.com/files/9e8e56cf-c184-4f65-90bb-3321f31c04fd/shadow_fight_2_mod_apk_download_free.pdf
    • https://s3.amazonaws.com/zetare/oxigenoterapia_pediatrica.pdf
    • https://uploads.strikinglycdn.com/files/5fab6ba3-9a3c-4122-aec1-bb1b85ac3159/49053890405.pdf
    • https://s3.amazonaws.com/dinigugaxej/cast_iron_chiminea_parts.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_off0000cbbf.bin
2154964a32dd08639c8c1529da0506a1de2d768a71410fb27252b3ebc8fbe392
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBF 5464 bytes
font_01_sfnt_off0000de32.bin
fda0f2971e6f6f54a4f0fc969c35817df916a824615d09c3a43caefb0028dd57
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 10332 bytes