Malicious PDF — malware analysis report

Static analysis result for SHA-256 63943889d4ba9080…

MALICIOUS

PDF

89.7 KB Created: 2021-03-10 10:28:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 223b696e3766293a040b24be46d71ff9 SHA-1: 498cf2b5d65f2aa1e78b0e278f78e0b331f8d6a7 SHA-256: 63943889d4ba9080ee65ebdd38f0ac88fc026e7675fc679693825b4da1ff702a
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. One of these links, https://nipisod.ru/award?keyword=industrial+canning+process+pdf, is flagged as unknown reputation. ClamAV and an ML classifier also identified the file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external links suggests a potential redirection or phishing attempt, aligning with T1566.001 (Spearphishing Attachment).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=industrial+canning+process+pdf
    • http://uggi-ugg.com/30255307977uhu56.pdf
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/11104a.pdf
    • https://cdn-cms.f-static.net/uploads/4421639/normal_603dbb93068e2.pdf
    • https://static.s123-cdn-static.com/uploads/4410416/normal_5ffdeace793b8.pdf
    • https://cdn-cms.f-static.net/uploads/4426687/normal_600ddb3f038cf.pdf
    • http://zukirudon.mypressonline.com/how_to_cope_with_bpd_mother.pdf
    • http://idealica-co.site/vovivozak8uhvh.pdf
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/7560531.pdf
    • https://cdn-cms.f-static.net/uploads/4495975/normal_6017fd63d4afd.pdf
    • http://vurenosul.22web.org/cornerstone_guitar_chords.pdf
    • http://manamuposa.getenjoyment.net/pharmaceutical_calculations_howard_c_ansel_15th_edition_free_download.pdf
    • http://taxutipepavij.iblogger.org/mukamidezexagesuxijajeb.pdf
    • http://idealica-italy.site/dd_2nd_edition_classes1g0in.pdf
    • https://cdn-cms.f-static.net/uploads/4410717/normal_603310023e29b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/767d98c4-bd24-4d7b-9b08-6d131a3a10db/les_mis_cast_25th_anniversary.pdf
    • http://kelopejawutan.rf.gd/good_morning_beautiful_flowers_images.pdf
    • http://vidugozu.atwebpages.com/77054577626.pdf
    • https://uploads.strikinglycdn.com/files/bdf8b6fc-be71-423d-831c-e33dd847767d/does_everyone_need_a_real_id_drivers_license.pdf
    • https://uploads.strikinglycdn.com/files/6edd7ad5-b5ae-4afd-b00f-c9ec6c7003db/how_to_fix_canon_ip2770_black_ink.pdf
    • https://uploads.strikinglycdn.com/files/c5c3ccdb-9e36-4c69-bc56-ad2285405326/what_to_eat_to_lose_weight_meal_plan.pdf
    • https://uploads.strikinglycdn.com/files/a83f9422-ddfb-4cae-ae30-a7017e794fe0/bellus_3d_face_app.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_off000122f3.bin
b8794175b4eab201fa2f35cc9ef8b9fc44c1c965b938824ce944f3e9cce2b98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 5260 bytes
font_01_sfnt_off000134e5.bin
066a9ee1714ee4640be52455eada1f62fca15aa1d4a904c47fbcaf3cd4706801		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 10800 bytes

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