Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05d1eb7c9e0d45c…

MALICIOUS

PDF

75.2 KB Created: 2020-11-17 22:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d6f4a92865cb82e3973d0f68e2ad01e SHA-1: 1e76efe9d2c6e2e3ce95e055f89e507ad38fe8dd SHA-256: c05d1eb7c9e0d45c846f59ebf22bb2bd44eed067b843e6d6e144e32ab8b0cd9c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics indicating it functions as a redirector to malicious infrastructure and a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/123?utm_term=alabama+moon+free+pdf
    • https://wabebapag.weebly.com/uploads/1/3/4/3/134335427/6540822.pdf
    • https://leziwave.weebly.com/uploads/1/3/4/4/134446015/naferilorogowariv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vesubodufisi/11348063439.pdf
    • https://uploads.strikinglycdn.com/files/10692c7e-911a-4820-bd4e-284baeff4155/acids_bases_salts_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/852b2791-1579-4a19-ad97-e286a8a76658/hypixel_skyblock_berserker_guide.pdf
    • https://uploads.strikinglycdn.com/files/723f22ec-a950-4ee4-a9f6-933683c9cf91/go_to_hell_lyrics.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/tewaxejabu.pdf
    • https://uploads.strikinglycdn.com/files/d0fb34ff-cd82-4b62-8279-54f4ed52ab28/36650125744.pdf
    • https://s3.amazonaws.com/fefurorobumi/32007666853.pdf
    • https://s3.amazonaws.com/jepavilutabilel/free_rock_of_ages_movie_online.pdf
    • https://uploads.strikinglycdn.com/files/b76fa915-c2b2-471e-a51a-647c0970155a/adiemus_chords.pdf
    • https://uploads.strikinglycdn.com/files/8e4d8a0f-1d34-4259-8dd7-e82376fa37ce/26928701368.pdf
    • https://uploads.strikinglycdn.com/files/d79b5c4b-92c0-4242-a362-483384c0fb22/rufanakes.pdf
    • https://uploads.strikinglycdn.com/files/35720990-dd75-45c7-9f87-7021f912682e/gefuvozenujogelevisipa.pdf
    • https://uploads.strikinglycdn.com/files/e7860b2a-fd01-4e3d-9c49-abb8d782169d/street_fighter_4_android_full_game_apk.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_off0000eb24.bin
b82686f5043e9a483fdc7e2599133f6d8ef441f3601520420463aca6adae4aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 5140 bytes
font_01_sfnt_off0000fc83.bin
cc2a17823a85d8987aed9b6046fafbcfa45cdd950f4e77996160858298f121f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 10392 bytes

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