Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0e9ae9a7649a0d…

MALICIOUS

PDF

80.3 KB Created: 2021-06-05 02:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ee1efc3c99c60bf2692ede8e02f50605 SHA-1: 5e9f5e332462f2aad0e60b633f4e9ebfd4f798c3 SHA-256: 1f0e9ae9a7649a0d4faf36050421a4d22d06bf520fde957ee0c5cf7a7f9ee678
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or to host malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or content-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/pbw?utm_term=how+to+write+a+authors+bio PDF link annotation
    • https://vagapirub.weebly.com/uploads/1/3/4/6/134648019/2931006.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/c704d6df3faf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_606a081060ab4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5fdd33a88e9b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377407/normal_5fca7e61191f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408002/normal_5ff365cd24acc.pdfIn PDF document text
    • https://jisiresofuwidi.weebly.com/uploads/1/3/0/7/130739297/a0ce8d0a6.pdfIn PDF document text
    • https://rabavuvorek.weebly.com/uploads/1/3/1/0/131070866/5646443.pdfIn PDF document text
    • https://sifegofariwe.weebly.com/uploads/1/3/1/4/131437131/aea8d591fb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_601e1bfa16f2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokulus.pbworks.com/f/19891871960.pdfIn PDF document text
    • http://ropotupi.pbworks.com/w/file/fetch/144497622/what_does_take_two_tablets_daily_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6864ff99-a06d-43e8-9f3b-0a820f52cf2c/pelagic_autopilot_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f41f3a4-3693-4132-82ab-69047d2e8e58/dopoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c52fee-ad22-495c-a579-495c7eaac8d7/paxuki.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144634311/pejifekozox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee58f75b-55e8-42f3-8335-8c8cdc36701e/swann_enforcer_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55465eeb-e14b-4761-99ff-14639b36adc2/42642599932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a78037d-0aa7-4ef1-ad8d-ff0f02c5fe0d/josaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd33271-bd8f-4da6-acf3-6f026ee25476/kaxavoredakiroxemizepovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86806297-774d-4d8a-8a5d-608553d648fb/building_wealth_one_house_at_a_time_updated_and_expanded_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/533868fd-e953-44a3-b4b2-e5325a50399e/69176464634.pdfIn PDF document text
    • http://dewubuk.pbworks.com/w/file/fetch/144422160/chal_mera_putt_2_full_movie_download_720p_filmywap.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_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 4936 bytes
SHA-256: b94c09684edc5e81d1b1b8ae9067d77b04f03f432cffeea6fcce8703a30c185a
font_01_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 11372 bytes
SHA-256: 4f127582d864b35335977a242bdf1eb03e5afd49c774c8bf43edfac4d67ef8e6