Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b092ed160d07ac…

MALICIOUS

PDF

82.6 KB Created: 2021-05-25 01:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77746db30493f36787cdedac754dea8d SHA-1: 2e6a16ded1be12a0c72fe9d76fef20e37f887473 SHA-256: 36b092ed160d07ac33164d449422e8072272323f6e2b2cdc0de652f109e18720
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF link farm, with one primary malicious URL pointing to 'pelibifir.ru'. This suggests the document's purpose is to redirect users to potentially harmful content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/strik?utm_term=socialismo+utopico+e+cientifico+diferen%25C3%25A7a
    • https://lojapajarete.weebly.com/uploads/1/3/4/5/134521209/juvuvose.pdf
    • https://gevivakeje.weebly.com/uploads/1/3/0/7/130775257/jidimofu.pdf
    • https://cdn-cms.f-static.net/uploads/4387566/normal_6019a25abfd20.pdf
    • https://mazegiwekode.weebly.com/uploads/1/3/4/5/134529082/jatujitabufibuw.pdf
    • https://static.s123-cdn-static.com/uploads/4500911/normal_6006be3e7cb35.pdf
    • https://nirotobilimob.weebly.com/uploads/1/3/4/4/134484477/sedapometodiv.pdf
    • https://fogebutozedelig.weebly.com/uploads/1/3/0/7/130776223/650783.pdf
    • https://cdn-cms.f-static.net/uploads/4495262/normal_606cc8a44dda9.pdf
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/a84a8.pdf
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/rerefedub.pdf
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/bexifafejujojagu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vaxebisapesi/what_to_do_when_the_battery_light_comes_on.pdf
    • https://s3.amazonaws.com/matogapibelifiv/safety_first_car_seat_for_infants.pdf
    • https://uploads.strikinglycdn.com/files/c0595040-ea4e-4f78-8098-2302a3a21199/does_brain_fog_go_away_after_menopause.pdf
    • https://s3.amazonaws.com/xapidajovaji/casio_protrek_watch_manual.pdf
    • https://s3.amazonaws.com/jafujasiwetid/what_is_technical_writing_style.pdf
    • https://uploads.strikinglycdn.com/files/fc267733-d773-4fc0-a737-14f790ee2504/gnostic_gospel_of_thomas.pdf
    • https://s3.amazonaws.com/godoremitiwuja/abcd_rhymes_free_mp4.pdf
    • https://uploads.strikinglycdn.com/files/b8749e34-d72c-42cc-bd52-729a48e8123e/apc_br1500g_back-ups_pro_1500_va.pdf
    • https://s3.amazonaws.com/samopakamefap/stretching_your_ears_guide.pdf
    • https://uploads.strikinglycdn.com/files/f474aec5-d438-49da-b8bd-956804ab817e/55469072259.pdf
    • https://s3.amazonaws.com/pogolo/how_to_do_call_forwarding_on_verizon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ce.bin
2a0c5f6d14d8b67d2add53373ca8e8d30159a654cb78069b68f359c36a8b9146
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 5468 bytes
font_01_sfnt_off000105f7.bin
01cd56cd25ce714dd28ff40794a4d9e04655e9040abd613a39785a03127151e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 12556 bytes
font_02_sfnt_off00012c40.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 4324 bytes