Malicious PDF — malware analysis report

Static analysis result for SHA-256 034a16cd6328c829…

MALICIOUS

PDF

89.7 KB Created: 2021-01-05 19:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d10aed364d7ecef81930fd54277279d7 SHA-1: 3359609624a68e8775e610e91401fc5cd9cce9df SHA-256: 034a16cd6328c829b69c9bac9db9aab53c09623a29f8bf3cac97ca5752f4b5e0
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=get+the+guy+matthew+hussey+free+download In PDF document text
    • https://dudafenerow.weebly.com/uploads/1/3/4/9/134900552/dukumuj.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/2542664.pdfIn PDF document text
    • https://sexaxekeka.weebly.com/uploads/1/3/5/3/135313825/33e5e5d19cb7219.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/4821141.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/navukezekuxuvunasi.pdfIn PDF document text
    • https://semukozev.weebly.com/uploads/1/3/4/4/134493414/632267.pdfIn PDF document text
    • https://kidubaviputotej.weebly.com/uploads/1/3/4/5/134520398/8994765.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/128294.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/gonozinuwobaxu.pdfIn PDF document text
    • https://xegadoponuxi.weebly.com/uploads/1/3/0/7/130775279/pobupi.pdfIn PDF document text
    • https://wevepuxobufo.weebly.com/uploads/1/3/0/7/130776344/51f86f59308e046.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/fajonubinomeder/wftda_rules_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ebc7be9-3255-456b-9447-b2a709816bb2/35227988942.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/calaveritas_literarias_infantiles.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_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 5544 bytes
SHA-256: 6238c583185a9b1de54d12e8987f2bbfcf3dfd1b0b9ae2e5dff4f51e9ff5e8b5
font_01_sfnt_off00013300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 11368 bytes
SHA-256: 1de8deecbd88c735daee432208ac6860ab7d20258bbb021c2acc8791a6c8472b

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