Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c584b68054482d…

MALICIOUS

PDF

81.6 KB Created: 2021-03-30 06:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 85c04454ac005881e5a7261cf1b446a5 SHA-1: 7f313e8e1e5697135a9d8f6bcd6dae1b3f05ad25 SHA-256: a2c584b68054482d6766142c9a3c798bf6e21e49a393dd7fd74d9493c92dbad8
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing attempt, where the document likely prompts the user to call a fraudulent number. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://resalured.ru/award?keyword=bicycle+day+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501777/normal_5fea051f50862.pdfIn PDF document text
    • http://sale50.pro/vatatanemi7se2d.pdfIn PDF document text
    • http://itchia.space/kupuluxozemiwitidebiixxps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_603416849be6c.pdfIn PDF document text
    • http://opit.space/math_worksheet_for_1st_gradeoffcz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465907/normal_5fc7edcc9a535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_602e75e4ccc39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/purawuma/38601043183.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/ge_fanuc_series_one_programming_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd956c31-8fda-42b8-815e-76528db58ae0/23006174508.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/80994382407.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/76153595979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7de8dd8-8e9d-4cb1-ba25-b3991579c926/best_forex_trading_technical_analysis_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618e93a1-13f5-4318-9bf1-b0a28b5e7a49/tom_clancy_ghost_recon_breakpoint_update_1.14.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_7bcfe7dc02d14cc0b374117a38ff89db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be763ee6-f4b6-44c7-a5a8-ede8858a2e19/sakojonurodilajofavuvatum.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/sufezajifupofikudejike.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/sipibulotetunirokefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e464fc2-5014-4e90-9aa0-6b6d25f918e3/types_of_reading_and_writing_disabilities.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_5bfdfdd6a15f4e7c8f4b4306706468be.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 4832 bytes
SHA-256: 910d14205ba1141fec1baa1ea97e79bf5419ecbc91ed079e6bab7203e1875f7d
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 10544 bytes
SHA-256: 16b7490f75f7b68eac3710125be4f998a1cd51ed5839cf08b75301292872ef84
font_02_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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