Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbc7c1ae83b49fc…

MALICIOUS

PDF

116.2 KB Created: 2021-04-26 19:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8287c95bdcd6333c6f9df2675de69e0 SHA-1: 998504cd2dab4b77bf40493d129b5f8fa948278e SHA-256: ddbc7c1ae83b49fc8ab19cb402d3f13ba0239b6e01a828fb0bccb1e9146c5775
176 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, including a large link farm, and a primary URL that appears to be part of a phishing or scam campaign. The heuristic 'SE_CALLBACK_LURE' suggests a callback phishing or tech-support scam pattern, indicating the document's content is designed to deceive users. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pelibifir.ru/strik?utm_term=how+to+clean+waterpik+flosser
    • https://cdn.sqhk.co/tisojubew/Egc5Djd/zombie_offroad_safari_hack_game_download.pdf
    • https://cdn.sqhk.co/nukuzulu/iffhgge/nervous_nail_biting_meme.pdf
    • https://cdn.sqhk.co/gesokusa/LhhTkhe/50278052780.pdf
    • https://cdn.sqhk.co/zadoweferoxe/fAvckhL/endress_hauser_devicecare_sfe100_download.pdf
    • https://cdn.sqhk.co/mekurapiw/iiifgcU/milerifiduw.pdf
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/2615acae15.pdf
    • https://cdn.sqhk.co/juvowisire/jbShagi/40528615341.pdf
    • https://buzowoxeferoxo.weebly.com/uploads/1/3/4/6/134662453/bivisiramulurajebus.pdf
    • https://cdn.sqhk.co/guvevifowo/jjhjhgg/rapunzel_dress_pattern.pdf
    • https://cdn.sqhk.co/dovoxukeni/8nidHiK/chromecast_built_in_amp.pdf
    • https://cdn.sqhk.co/mabisurud/hf9jggj/wrc_the_official_game_mod_apk_revdl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2149434f-ec2e-427d-9896-d7b09f145a7e/joyce_meyer_list_how_to_be_miserable.pdf
    • https://s3.amazonaws.com/jasipefulaxiduj/83779975591.pdf
    • https://s3.amazonaws.com/rodiligarexo/vowakazuketiniref.pdf
    • https://uploads.strikinglycdn.com/files/fdd229b2-04c2-43dd-8e22-23197eeced87/fedorowulez.pdf
    • https://s3.amazonaws.com/dinilederu/40928034940.pdf
    • https://uploads.strikinglycdn.com/files/f921ff17-b891-4320-9370-b2939a45cb3e/devoboxikudejola.pdf
    • https://s3.amazonaws.com/pisik/board_meeting_minutes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001864f.bin
140e5c08290c9e2f295f829eae0b8b68abf2be669b75324a3e5981f7a469e44c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1864F 5124 bytes
font_01_sfnt_off000197e4.bin
0460c62b54c03a0f6ca3ec359597de032aa6c54cdb66a938161928b6df4d1549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x197E4 12968 bytes

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