Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc9d34a62ea59cc…

MALICIOUS

PDF

73.2 KB Created: 2021-03-26 07:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f28718336f790c6a432509822aedf42 SHA-1: db6f6168ba539f842822f7d12e078aaa1213476c SHA-256: 1bc9d34a62ea59cc199e5eaa81ce56a0445b37aa5e1acd67771d50cec32037a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=cake+portions+guide
    • http://hamlikjorettoop.ru/axial_scx10_2_jeep_cherokee1hesi.pdf
    • http://stylecurtains.com/ielts_speaking_part_3_topics_with_answerswzg7h.pdf
    • http://robot3.site/gobavonegipfxkh.pdf
    • https://cdn-cms.f-static.net/uploads/4369306/normal_603330946093c.pdf
    • http://hookup757.fun/27255967705ltbco.pdf
    • https://cdn-cms.f-static.net/uploads/4448545/normal_60222473df6f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/werowibovezoje/kodomixofadusagapoxu.pdf
    • http://rezujadutifinom.rf.gd/36297765761.pdf
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_c493a68782994fa0a0fb5f5dc6a69628.pdf?index=true
    • https://s3.amazonaws.com/kefiperizonofu/54144304115.pdf
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_fc45be27d59d4611adf0f8c22c1c4725.pdf?index=true
    • https://s3.amazonaws.com/xezonijida/struts_2_framework.pdf
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_52bdad911757439fad9947c806943f41.pdf?index=true
    • http://nekaluro.rf.gd/27586400279.pdf
    • http://kojelowebug.rf.gd/authorize_letter.pdf
    • https://s3.amazonaws.com/mokamoba/ethical_hacking_course_in_hyderabad_ameerpet.pdf
    • https://s3.amazonaws.com/wamatasamegu/jobekakafatefotivajaxipa.pdf
    • http://wujitotulofok.rf.gd/usos_del_acido_acetico.pdf
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_c1307f25db794bd8a1beb52513c4d88e.pdf?index=true
    • https://s3.amazonaws.com/sevoga/62709811618.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_off0000e274.bin
16813cb77c5aca642e99f6709ae761cf2ef3d54243250321f186167ff14730db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 5064 bytes
font_01_sfnt_off0000f3bd.bin
1074890766939f1d19febe4a3255e86216a60e378c4c5ee072809c7962dc136d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 10668 bytes

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