Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e08eed02a832fa6…

MALICIOUS

PDF

80.8 KB Created: 2021-03-18 10:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17e938267e8086049954aa062c07f909 SHA-1: 134a3cc411241203419f1fdd42a25bb7a749becb SHA-256: 7e08eed02a832fa654ce0e56d8f2ba208f0fb2fb017b1a1db45c59d4d76703e2
214 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm designed to distribute malicious content. The ML classifier output of 0.999785 further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=the+aeronaut%2527s+windlass+pdf
    • https://befapoge.weebly.com/uploads/1/3/1/6/131637854/c5677a56dc90.pdf
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/zerelumubemoxutasedu.pdf
    • https://nogetutiru.weebly.com/uploads/1/3/4/7/134711470/2e91656c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_f0e899bdba5d469995fa565b7f474963.pdf?index=true
    • https://s3.amazonaws.com/mudurixo/96314497079.pdf
    • https://uploads.strikinglycdn.com/files/a0f3ef47-a965-4e74-b749-001c20ce2420/13681264166.pdf
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_26a80d6d2e3b425da9b91e439484447f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6f0d182b-16ec-4397-9c1a-436e6317a850/burger_king_fries_carbs_small.pdf
    • https://s3.amazonaws.com/mutirexa/zetovod.pdf
    • https://uploads.strikinglycdn.com/files/c17929c4-a10d-45b7-86b9-877bed10b6ae/interview_questions_for_nursing_leadership_positions.pdf
    • https://s3.amazonaws.com/viboxikuz/nazodexoriteteviletolesu.pdf
    • https://s3.amazonaws.com/baritexovopa/anti_discrimination_board_complaint_form.pdf
    • https://uploads.strikinglycdn.com/files/822cad3f-e59e-40c1-982c-533d70a1f11a/magnum_energy_inverter_reset.pdf
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_1a02704d75b1466bb5f6636900db6944.pdf?index=true
    • https://s3.amazonaws.com/pokorevalaxex/80802664249.pdf
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_1f7f1407244343d8b28b2209fa302e0f.pdf?index=true
    • https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_74a68ba930d34060ae188b958589739b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/abe0bed8-8356-40d9-a126-ef330fe7e277/garmin_vivofit_3_replacement_band.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_off0000ff82.bin
a897a281c8945582bd252149c0bd6064ab8f3999d77565b7f001034061a3996b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 5204 bytes
font_01_sfnt_off00011146.bin
6d2f7f0e2c99e216d22c8a98354060bb461b8f91d616bb820eaf42052a10be4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 10764 bytes

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