Malicious PDF — malware analysis report

Static analysis result for SHA-256 18824a354b419e5c…

MALICIOUS

PDF

67.1 KB Created: 2020-11-16 22:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5d095fefa9565ce0f520ad96997d053b SHA-1: dfb61b4e6a1f878ad328da4948e7ded3f92de6d1 SHA-256: 18824a354b419e5cf6042d04911ba128fdcf6fbb007b98547f7fd4882c294df6
312 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits critical heuristic firings indicating it is a malicious redirector and a brand-impersonation credential phishing lure, specifically impersonating Apple. It contains a link farm with numerous URLs, including a redirector to 'traffmen.ru' and multiple links hosted on disposable domains like 'weebly.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a query about pints and quarts, suggesting a lure to a fake informational page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/cf01c361ff.pdf.
  • 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://traffmen.ru/123?utm_term=how+many+pint+equal+a+quart In PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/cf01c361ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fa46ab6e15c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f8e166d605a1.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/wobokovukomat-veramepemif.pdfIn PDF document text
    • https://bufazojilenove.weebly.com/uploads/1/3/4/6/134639622/9157949.pdfIn PDF document text
    • https://tosofovopige.weebly.com/uploads/1/3/3/9/133998067/putizupigido.pdfIn PDF document text
    • https://winapusumebut.weebly.com/uploads/1/3/4/6/134695108/sagituxorefekofufot.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/timelaner-jibivivudokexoj-bagopasufa-giruti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_5fa9909b54bca.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/6741250.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/5728570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5f8ebae114299.pdfIn PDF document text
    • https://luminesip.weebly.com/uploads/1/3/4/1/134108660/bigomupazex.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/83d9d5d5-6667-4875-8347-64f211463102/bunivaziduwuvodivukosa.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/buffalo_wings_and_rings_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/152309ab-f2fa-406c-9596-8c340878f45a/dikemuzidabiwaraw.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_off0000c8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8ED 5068 bytes
SHA-256: a2cb2db3b68b163f36636daf18d9e6a4833915064d39eb1b92f2b17633b5d7a1
font_01_sfnt_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 11176 bytes
SHA-256: 20060c5a827a03c2b2861c318bac49ae83c57641c69de43aa0b42fca30c728d1

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