Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b56e2bfe36d81ef…

MALICIOUS

PDF

68.0 KB Created: 2020-12-01 06:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dff0d48dc7cdcf7d461bb4ee855d3e8b SHA-1: 64324892bd475c597580fccca03172980696e4b3 SHA-256: 1b56e2bfe36d81ef4f5dbf7ad65bf2379a32ba9cbbb78d7742d98528d57a29ef
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one primary URL pointing to a suspicious domain. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of generating SEO-optimized links, often used for phishing or distributing malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

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
  • 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.
  • 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://traffset.ru/strik?utm_term=linear+equations+slope+intercept+form+worksheet PDF link annotation
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/sedikalawap.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/zutilipevozafeguwu.pdfIn PDF document text
    • https://sajesugepila.weebly.com/uploads/1/3/4/4/134467456/xomaza.pdfIn PDF document text
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/4f1d45792a5ceed.pdfIn PDF document text
    • https://xamonato.weebly.com/uploads/1/3/2/8/132814301/fodixewisub.pdfIn PDF document text
    • https://kusopexel.weebly.com/uploads/1/3/4/5/134526262/dexivesejiwifi-wexajize.pdfIn PDF document text
    • https://vewawuwidavejo.weebly.com/uploads/1/3/4/4/134403009/rigoxulu.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/zudawizofiminabujeju.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/4618549.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/b94034.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc107c868612547ed5eda4d/t/5fc5ca33173fb5383b6c184a/1606797878332/gudrun_chocolates_costco.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dde4403f5353fd9590af/t/5fc22860145a8629dcf93a66/1606559841037/calories_in_fried_potatoes_and_onions.pdfIn PDF document text
    • https://s3.amazonaws.com/giwurode/the_chocolate_touch_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c0f59955c744b53accb6/t/5fc2e0769ee0f32b87b2d098/1606606967784/53346167132.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24D 5360 bytes
SHA-256: 6134d18ad49b1ac76c5f8ce9dade5f605840973dcd2fda5333974102575da2b0
font_01_sfnt_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 9468 bytes
SHA-256: ed1faca641ca22f01fcde9c215cba46f8d4829207c7b5d237835c6b118bfea8c
font_02_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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