Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c3a6ce39a5c9e4…

MALICIOUS

PDF

82.6 KB Created: 2021-03-18 13:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 089e8c4c3ecd9c1184d0b31e6cc1cd19 SHA-1: 86587d6bfc7fde9af307fd572ae321fa997b8a1a SHA-256: 34c3a6ce39a5c9e4d49cf14ce52c6ef87da0a8cfc3effb179da822ad1c2e3e09
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lead users to phishing or malware download sites. The document body is heavily obfuscated and appears to be junk data, further suggesting a malicious purpose rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/wb?keyword=iatf%2016949%20training%20presentation In PDF document text
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/vaginivoruterotevi.pdfIn PDF document text
    • http://toluvubub.mygamesonline.org/diagnostico_de_neuralgia_del_trigemino.pdfIn PDF document text
    • https://zurejekivob.weebly.com/uploads/1/3/0/8/130813755/3450052.pdfIn PDF document text
    • http://gunofixe.medianewsonline.com/what_are_the_different_types_of_capital_market_instruments.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/pagesedowagowuzej.pdfIn PDF document text
    • https://bozusobogopi.weebly.com/uploads/1/3/2/7/132711975/lulobupanepaziruzu.pdfIn PDF document text
    • http://dfds.in/modal_perfect_exercises_b2k2o6m.pdfIn PDF document text
    • https://najunewuzerus.weebly.com/uploads/1/3/1/4/131408250/5225547.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/c41a608238.pdfIn PDF document text
    • http://loxiturizule.sportsontheweb.net/96685964715.pdfIn PDF document text
    • https://tumalurezap.weebly.com/uploads/1/3/2/6/132696080/lekil-zugozega.pdfIn PDF document text
    • http://majikok.mygamesonline.org/91213006734.pdfIn PDF document text
    • http://my-favshoph.online/kurojatapu2r7j2.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/tenamunuxejenagomuvem.pdfIn PDF document text
    • https://zufodivovogopot.weebly.com/uploads/1/3/1/3/131383523/rozosuzok_matovozij_muboziwetexip.pdfIn PDF document text
    • http://xubajur.mygamesonline.org/definition_of_policy_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_a3f8dae85da64417a107b841cd442c90.pdf?index=trueIn PDF document text
    • http://sewujajapivix.onlinewebshop.net/acute_heart_failure_management.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_91449c8669fa46afaa63440c75b2ec0e.pdf?index=trueIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_b48130ff46f34d04968de4d51a83bc13.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 5424 bytes
SHA-256: 0963cbf052bbb2a695dac11d003802f9312188d133153cb37353179cc507a06d
font_01_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 10996 bytes
SHA-256: 58b8507e4fdf6b1b92c732f83d267a0e802db39bc134fdbdddfb35f545768284