Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03ac2bea449ef4b…

MALICIOUS

PDF

78.2 KB Created: 2021-03-01 13:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 12d8a07a0b363d11bab06ed5a4119bc6 SHA-1: bb6a72b0323d8f0535ef42e40c0d3e123add1c0d SHA-256: e03ac2bea449ef4b36049207c64a97ce30057c3ad702279fc1eb2cb0ed06378e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://crophysi.ru/award?keyword=supply+chain+management+internships+spring+2021, is flagged as an external URI. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://crophysi.ru/award?keyword=supply+chain+management+internships+spring+2021 PDF link annotation
    • http://fomolazekuwok.22web.org/making_faces_kevyn_aucoin.pdfIn PDF document text
    • https://faxojoduso.weebly.com/uploads/1/3/5/3/135351685/7092756.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/5603761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413346/normal_5fd9b009b39f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_600f451d93873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_6032c5410e801.pdfIn PDF document text
    • https://bupowuxa.weebly.com/uploads/1/3/5/3/135317106/4639254.pdfIn PDF document text
    • http://naxawibumeso.iblogger.org/strikemaster_ice_auger_carb_kit.pdfIn PDF document text
    • https://likunemotiro.weebly.com/uploads/1/3/5/2/135299998/3344935.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/napoledunadigo/41103030352.pdfIn PDF document text
    • http://kovoxajinuf.epizy.com/constitutional_amendments_1-_27.pdfIn PDF document text
    • http://kitalanexu.epizy.com/90235458248.pdfIn PDF document text
    • http://rolaxaja.rf.gd/macromedia_freehand_mx_free_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/diana_hamilton_work_in_progress_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/marriage_anniversary_invitation_card.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/zabixigoji.pdfIn PDF document text
    • http://surugen.epizy.com/35982301561.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/madigikama.pdfIn PDF document text
    • http://valogaberel.rf.gd/28651164370.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/4262521205.pdfIn 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_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 5876 bytes
SHA-256: 72051c838929f984cdf6a7c413dc910bd50976102c4b5d3db49945a07d40f038
font_01_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 10668 bytes
SHA-256: 83ad3aaede275b6078c064a8b8cff0c7b78d7cd7ecac0761cfa0f3fed996763f

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