Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca05e83731ab7f8…

MALICIOUS

PDF

66.2 KB Created: 2020-12-11 02:34:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ddb97ab40dc79a9c96265a13751d6cdc SHA-1: 754c5003b24535da2d1af9ac0a7bd2ac1ff352b5 SHA-256: 8ca05e83731ab7f861ebf748dcda504389d21959c0bd8719c07cfee8472f7d82
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation scheme. One critical heuristic indicates a link to known malicious redirector infrastructure, increasing the risk of users being directed to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/aws?utm_term=happy+birthday+variations+piano+sheet+music+pdf In PDF document text
    • https://fevuvewuvadudu.weebly.com/uploads/1/3/4/6/134650824/lefis.pdfIn PDF document text
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/levatolupakujadud.pdfIn PDF document text
    • https://sijoxedewi.weebly.com/uploads/1/3/4/3/134346210/677c9cea23d3.pdfIn PDF document text
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/kadofepaxijome.pdfIn PDF document text
    • https://teduminerat.weebly.com/uploads/1/3/4/6/134665194/kololutopumag.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/6978806.pdfIn PDF document text
    • https://tawafijagipuju.weebly.com/uploads/1/3/4/6/134684871/gojatekofonar.pdfIn PDF document text
    • https://vejefoxebeses.weebly.com/uploads/1/3/4/8/134860837/05e839.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1796fdf132613bbc1d0b8/t/5fcf7798ba7003536eaca0a3/1607432088522/84651962202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa690184-6c1d-448c-b23b-23c7d7592079/79850376003.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/sound_forge_pro_11_serial_number_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5875b239b072291509c32/t/5fc7b9528f079636158518b9/1606924626855/51505089306.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/45943874035.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_off0000c489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC489 5628 bytes
SHA-256: 2d70ddca0c3d252cceb0dc22bb5179e6e8f1f9b10acfed4d4fb6755ca4e4fa4b
font_01_sfnt_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 10632 bytes
SHA-256: a2c02765e62ab440150e1f51e2d8a1149ac6257a731783aa1341dcafde2ad999

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