Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef549c85bfa5d7a…

MALICIOUS

PDF

93.2 KB Created: 2021-03-14 23:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abf1c0440fc104f5a71c665546bfb695 SHA-1: da2ee9ea55b978d48560066d659bf5c07ffd6cac SHA-256: 5ef549c85bfa5d7a470a90b85d166041ef08f63649d0ad3a9d0197435dcae9d0
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains text related to 'Assassin's Creed Black Flag guide PDF', likely a lure to disguise the malicious intent of hosting numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=assassin+s+creed+black+flag+guide+pdf
    • https://tizonitiwu.weebly.com/uploads/1/3/4/7/134734793/1056625.pdf
    • https://dodaxopaz.weebly.com/uploads/1/3/4/8/134865523/bemurazakonudole.pdf
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/xakevip-vopibilaje-tezosikadakup-fipasus.pdf
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/sokeguz.pdf
    • https://cdn-cms.f-static.net/uploads/4416139/normal_604c9fc598328.pdf
    • https://cdn-cms.f-static.net/uploads/4372721/normal_6014fabcc99ff.pdf
    • https://lemitixodage.weebly.com/uploads/1/3/4/8/134868200/sutuj.pdf
    • https://cdn-cms.f-static.net/uploads/4377379/normal_603b21c63765b.pdf
    • https://cdn-cms.f-static.net/uploads/4444351/normal_600f7636076a5.pdf
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/pefebebikevirelif.pdf
    • https://nonafinawajag.weebly.com/uploads/1/3/4/3/134331790/c27051d.pdf
    • https://mikezopa.weebly.com/uploads/1/3/4/3/134366842/jesumunomire.pdf
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5fc69015816a1.pdf
    • https://ganipomadajo.weebly.com/uploads/1/3/2/6/132695424/6610118.pdf
    • http://tedisesux.22web.org/senadimituvobef.pdf
    • https://cdn-cms.f-static.net/uploads/4481271/normal_6010962b8f068.pdf
    • https://cdn-cms.f-static.net/uploads/4378641/normal_602607835d606.pdf
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5fcebc9301d25.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://punegejofuj.epizy.com/libusija.pdf
    • http://rajiwewovipu.epizy.com/fiwavilo.pdf
    • http://misibinebob.epizy.com/ffxiv_5._0_dancer_guide.pdf
    • https://uploads.strikinglycdn.com/files/60d1f4a9-a4c5-44af-bd9c-52bb35eae1cd/kuzigokenokajimopikigev.pdf
    • https://uploads.strikinglycdn.com/files/5470f464-07c1-4b47-a565-a14e5316788a/how_to_get_optical_audio_on_pc.pdf
    • https://uploads.strikinglycdn.com/files/c42a9b67-a6fe-4b44-ab09-38246ae89649/duralast_jump_starter_900_charger_manual.pdf
    • https://uploads.strikinglycdn.com/files/aa040ad2-dc9d-4c97-953a-2bf4e4d9773b/91768635469.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_off00012d09.bin
1e451360b25f2e0334eccc7e29cf31aa9ba53049a15731756d70ea4e18a4eb5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D09 5516 bytes
font_01_sfnt_off00013fd5.bin
958f683d863aecaeeb8c2d40a91a73e06577556d6fc4b6679da3812aa88f1673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD5 11736 bytes

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