Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c64ce8e1ff72bd…

MALICIOUS

PDF

73.9 KB Created: 2021-01-09 14:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9dad3b360ef834acdfa8351cd920b24b SHA-1: 49d383b50f73501cfff51bc4c9c748b60d7649d7 SHA-256: a1c64ce8e1ff72bd65db65bd9e22f4b3a94b1073814dd96ce48c9d6aa3741307
214 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link and a PDF SEO link farm. The document body, though heavily obfuscated, contains text related to 'Gst audit report format in excel', suggesting a lure. The embedded URLs point to known malicious redirector infrastructure and a large number of other PDFs, indicating a campaign to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=gst+audit+report+format+in+excel In PDF document text
    • https://bekozowa.weebly.com/uploads/1/3/4/7/134713297/vagemeguwoki_pasameri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417329/normal_5fe14578608da.pdfIn PDF document text
    • https://vugiwaxe.weebly.com/uploads/1/3/4/7/134739196/9775821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477167/normal_5ff98902731a8.pdfIn PDF document text
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/c0cedb02cf03.pdfIn PDF document text
    • https://tixosame.weebly.com/uploads/1/3/4/5/134523113/588376009a9338b.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/8692963.pdfIn PDF document text
    • https://ritesevegozuvij.weebly.com/uploads/1/3/1/6/131606822/20ddd5c85793.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/597d12f65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lefemijip/nmims_bangalore_placement_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/54841209692.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/lenel_onguard_7._5_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/jet_plane_simulator_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/jujosokiwopaf.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/linowekakabidoradixeg.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/ruzizoramusajufifolabure.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_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 5400 bytes
SHA-256: 697a526eaa3f71c0a5a123d2f15a48ad198619a00c3d5cec7d4cbf2364fb8b8c
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 10240 bytes
SHA-256: 393f92c97bd9f7785cf451f4f1ac2d170850b74ccd25c9cecbcbf4cbc7779874

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