Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bef3a495bdcf2a…

MALICIOUS

PDF

69.5 KB Created: 2020-12-05 20:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6df7fd6d5e2e2779e867016d2e7e6499 SHA-1: 9d92144855e11ae96e764058079e3bff7e89a7d8 SHA-256: 83bef3a495bdcf2a5c69e1739bcfdae466c9efa46791c72c77aeda5949cdc352
104 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though partially corrupted, contains text related to 'interview answers' and the heuristic 'SE_URGENCY_LURE' suggests a deceptive tactic. An external URI, https://trafficel.ru/aws?utm_term=collaborating+and+partnering+interview+answers, was extracted, which is likely the malicious payload delivery URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafficel.ru/aws?utm_term=collaborating+and+partnering+interview+answers PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e01f2cf09257bd6be9c2/t/5fc3b75e08845d0924fb4269/1606661982540/wedding_cake_sizes_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78662995-681d-4c4d-ad52-7d131ff0693c/timex.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/myo-_inositol_metformin_hydrochloride_tablets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e133e1ed-4439-43a6-8685-713345b868a8/jepatadupimebolopo.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/gloomhaven_scenario_book.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc07dde27a199023ab34438/t/5fc1cf66e18c5c478e3e5d62/1606537063230/mossberg_ar_22_accessories.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/68049363881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc133428-f310-4d6c-8548-ba12ccdfa966/79611384883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6caebffe-742d-4633-8338-188176e3e7a1/zufidiwudira.pdfIn PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/dyson_cinetic_ball_animal_canister_vacuum.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfe7e212facd59cea75dab/t/5fc0fa8f3c02f22b9d303ba6/1606482580613/zajid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8698ab-afa3-4562-b6da-ac85becf8d46/zobiripaniritase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a380f46-9d02-4b99-bf3f-ca06f54c26dd/penuzifuzubunetelewitajoj.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/88629616442.pdfIn 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_off0000d1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CD 5324 bytes
SHA-256: 6e104c1909ed53d25e65aaa7054a305b70d7d1aec9f4e66d0b62afc6ec42281a
font_01_sfnt_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 10988 bytes
SHA-256: 4aa3c3ab44918c63ae39b5408c67c2e3b21bf41d6cabe39cc71ba01b6a18c988

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