Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc85daffa8c49de6…

MALICIOUS

PDF

80.9 KB Created: 2020-12-19 22:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 584f7606aaa092f46ab50a7437da967e SHA-1: 3065d690d5ef55981ee5c0a942f10e13318b9ade SHA-256: fc85daffa8c49de66c8319321f265890162578eefcc07f0c92b528d27348e278
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, with one pointing to 'trafffe.ru/aws', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to an 'annual devolution index report', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=annual+devolution+index+report PDF link annotation
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/4303043.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cef940c-2889-48aa-b171-e30b9d2a2512/mopar_manual_transmission_conversion_kits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8cd32ea-9f89-413b-9cd6-c35ff4991d31/jasepavixidelo.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/drinking_100_oz_of_water_a_day_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/ssars_19_compilation_report_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/muxisamokej.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/vijosesodabok.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/torture_chamber_1_game.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/eos_1000d_utility_software.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/je_vous_informerai_ds_que_j_aurais.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/70427534779.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/41371675343.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/nalafe.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_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 4892 bytes
SHA-256: cb5faaa26cc42fa30affbe5b42bdbc1a772b0426144a686476ca8ff025eeda2d
font_01_sfnt_off00010fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 11424 bytes
SHA-256: edd5454be076ad1c6590fcf4922e11aab3d85e383923f0b5b5ec45097d6f6590

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