Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87cabac66549893…

MALICIOUS

PDF

71.4 KB Created: 2020-12-22 22:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cd7f1cef34457c8c35b6a42e7dcd9af7 SHA-1: 1d3bca6426b476e60e68d29610123040f6a8e9b1 SHA-256: f87cabac665498939b17936ee10f4d1b246f930762bc2450823234637b8a8935
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious sites, such as the one found at `https://trafficel.ru/strik?utm_term=smash+mouth+concert+covid`. The document body, though heavily obfuscated, contains keywords related to a concert and urgency, suggesting a lure to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafficel.ru/strik?utm_term=smash+mouth+concert+covid PDF link annotation
    • https://lilepixot.weebly.com/uploads/1/3/4/4/134462463/7350b299d30.pdfIn PDF document text
    • https://dovogejeromew.weebly.com/uploads/1/3/4/6/134666082/5235151.pdfIn PDF document text
    • https://virukuzababije.weebly.com/uploads/1/3/4/3/134350100/7819426.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/wunotarulekojukibat.pdfIn PDF document text
    • https://sasozepawises.weebly.com/uploads/1/3/4/3/134315695/riviwanovewusupofede.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/5650151.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/xodegekajefi-sotifijum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc2f9eaa3bf4b14abb69cf4/t/5fcdc2fc7ae85b53b2b1cd68/1607320325211/las_vegas_family_vacation_packages_all_inclusive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00ce2f5-0990-4494-bdc2-98d3e4de988d/wevobup.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0879da3bf4b14aba759f2/t/5fc33a42fa04221c7188c6f8/1606629955330/oral_herpes_yahoo_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdfdbf19d00c472c28c2758/t/5fe0309451a86c1b6c4f601b/1608528021219/ac_dc_discography_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be0c07c-ebb3-41cc-84c9-d066660ebdaf/grow_guide_download_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/773c273f-c539-42e5-a4a2-ce732b0110b2/78136552860.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c3aad26ff1194f72fc70/t/5fc122313c02f22b9d35d7bc/1606492722126/magnetic_field_viewing_film.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf50a9b1ed035389fe4b1/1606284555611/1984_hate_week_poster.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 5192 bytes
SHA-256: 3e4a44dd3758b13cbb35938d9173400c0c8f2fb4ed473fb188841674b73dce52
font_01_sfnt_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 10996 bytes
SHA-256: 3737b2a65e7f19e6430cd1c1b34cdd8215f43f1d9d79bf6e06d9fac180db12ca
font_02_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3