Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b46c0d14d04ba2…

MALICIOUS

PDF

74.2 KB Created: 2021-05-20 11:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2ddaa41e00e9ff9e8029fcb137eb1013 SHA-1: e4e14bb8e13103393c6eebb62eae265e2bbfc8b0 SHA-256: a3b46c0d14d04ba2052192298ca14243c45e7d8bdd55a4365e4845722ca51911
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL being 'https://kuzutuzo.ru/strik?utm_term=how+to+write+a+partnership+agreement+sample'. This suggests a phishing or credential harvesting attempt disguised as a document. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=how+to+write+a+partnership+agreement+sample PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462992/normal_5ff4a3af040aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_603be5bb02111.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484834/normal_5fdcaea79c8b0.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/zuvidogumijam.pdfIn PDF document text
    • https://xizulorojude.weebly.com/uploads/1/3/5/3/135391297/f4ecae060e56ed6.pdfIn PDF document text
    • https://xevosafodom.weebly.com/uploads/1/3/4/7/134739965/3fdcc2c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366003/normal_5ff676afde2c8.pdfIn PDF document text
    • https://jimiduwukav.weebly.com/uploads/1/3/1/4/131452794/12ee095d.pdfIn PDF document text
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/ede600b0769530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447095/normal_60504f781a296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_603cc1f720e38.pdfIn PDF document text
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/2307713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_60400eb7bc9ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422135/normal_5fe4e234b9d8c.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/liluvad/columbia_jackets_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/76351923254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a001585c-253f-41c6-b769-cc2cc26d1a2c/32503000396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b98672-b6bd-4287-a960-aca059e8dc34/how_do_you_find_the_secondary_short_circuit_current_of_a_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/30876984391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87443a4-4332-4898-bbc5-d085fdec4b61/29315334180.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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 5284 bytes
SHA-256: fd493c3ebf7fbbec0b5c2540ec29d9c67357dd5625fe3baf844378eef9ef0314
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10384 bytes
SHA-256: 38ea93717e75bebd546564db1297196e744df68ca755aefbc55ea16dac8729e1

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