Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c908a806cc7db0c…

MALICIOUS

PDF

97.8 KB Created: 2021-03-19 00:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: ae87a6eeed9f1675d027a54dfae7d01d SHA-1: 6aa2f2428e7b28d89d581fba0d20a14ec2b6b50c SHA-256: 1c908a806cc7db0c3d54e8a66eec709e73dc13e328729966a813e75ba8e8d5ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are part of a link farm, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=james+patterson+deadly+cross+series PDF link annotation
    • https://jeboxuxu.weebly.com/uploads/1/3/2/7/132710743/jupavoredakoru-gedadix-xofutif.pdfIn PDF document text
    • http://fegalaro.iblogger.org/91565135845.pdfIn PDF document text
    • https://kerobasoxegetun.weebly.com/uploads/1/3/4/0/134017970/minajuxobuwevubonom.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/6564231.pdfIn PDF document text
    • http://wefinexof.iblogger.org/wegugeweko.pdfIn PDF document text
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/8e8e412797395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab360938-c2b8-4d49-99de-7896e1ce484f.filesusr.com/ugd/bcd086_0d9a8c2c499343cdb20df72c90c10de6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasudikek/58726877282.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/zuxofavidukuregajijebis.pdfIn PDF document text
    • http://jigiwema.epizy.com/xavise.pdfIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_2e0e7b272d7141d3a793911ad481efed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a264a02-0e67-419c-8de3-833f6a23664b/farowovutagatiwijakor.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/berugana.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_3782dc75dbef41828e94fbee1d29502d.pdf?index=trueIn PDF document text
    • http://lusalelafujijo.epizy.com/latest_patch_notes_sims_4.pdfIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_608aec206b9949d9bfa101368ba27308.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08e27e4-930a-48fd-acde-9e3fb3d359c7/ramijebikebirolese.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/62100178696.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/how_to_bypass_boss_parking_brake.pdfIn PDF document text
    • http://betemeparax.rf.gd/ac_market_apk_file_uptodown.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_e30c36a274b34b36917b30dc29149c69.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_c27255093cdc44e6bc36b750208a3bf2.pdf?index=trueIn PDF document text
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_1657206ae20e4e42bd27e6ed97a65cef.pdf?index=trueIn 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_off000141b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B3 5308 bytes
SHA-256: 98f0fbbc5a7c88b2cf9a8f8285fabdf0849614f22f4e390c51c9694b9afd3730
font_01_sfnt_off000153b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B7 11548 bytes
SHA-256: d501c1e47a9b74c603104cebe47d3ba82743a39884b13383713a0b6a3ccea085

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