Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2bca5cf90ba2a9…

MALICIOUS

PDF

72.8 KB Created: 2021-03-09 12:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aa6fc929fad92a4195cd8a0b23871d89 SHA-1: 0e57e9e3dd82fe247225240e0966f97efa25bfba SHA-256: 8f2bca5cf90ba2a94ba1f3e1dee7ec4fce9e433789b89a471e005cbf75ad22ae
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily corrupted, contains keywords related to contracts and IT services, which is likely a lure to disguise the malicious intent.

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
  • 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.
  • 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://golowaki.ru/123?utm_term=contratto+appalto+servizi+informatici PDF link annotation
    • https://foxenezave.weebly.com/uploads/1/3/5/3/135316699/b3f1608f5f02.pdfIn PDF document text
    • https://gagufamuxolo.weebly.com/uploads/1/3/4/7/134748057/vezirakedatip.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/7th_grade_literary_terms_crossword_puzzle_2_answer_key.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/58060743854.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/bd963d.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/41ee554f830f80.pdfIn PDF document text
    • https://nipukidifa.weebly.com/uploads/1/3/0/8/130873732/bexinelezakepadir.pdfIn PDF document text
    • https://wixokaregojes.weebly.com/uploads/1/3/2/6/132681478/1448802.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/somesoruzez_koxugajope_fawolefufadofoz_tugejit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/088f2128-ccb5-47e3-9323-89d04b7ddbf7/ribefakaj.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/10156421570.pdfIn PDF document text
    • http://nudoritane.atwebpages.com/adverbial_phrases_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8209d839-0cdb-4709-a2a1-9afc4aef9165/shirley_jackson_scientist_biography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c923b51-f4d9-4604-a3ce-bc9ebe6a80ca/hitchhikers_guide_to_the_galaxy_cast_2005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50eb4ef0-582e-48bf-a6cd-ec4d2ccbc7ce/hard_bible_trivia_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e63a294-4690-4f36-b23d-30627526af7f/gewasawidozazukim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc8add7-6f82-44dd-8e84-cc2f040ed409/rufamopufukijulibotasukuk.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/how_to_maintain_my_proform_treadmill.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_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 5176 bytes
SHA-256: 2feb2990ff0b640f19c8bcba24875e6505121b2719e3e4b6df3960df8fd9a600
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 11248 bytes
SHA-256: a9d899c91d2645bdcca7be5960b08b25f89e12ba77cfab3b08f2dea098ba8276

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