Malicious PDF — malware analysis report

Static analysis result for SHA-256 2154a26412ed4733…

MALICIOUS

PDF

109.0 KB Created: 2021-05-29 07:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6f866e679de0b1ea2c0d1b528908fdb5 SHA-1: 8ed2fc74573ae79f02b5f061209fe77d2cf41354 SHA-256: 2154a26412ed4733b2d7ddcc4ec821b58832715ba70b594d0580d26bf24d2314
254 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, primarily through its use of redirector links and a link farm designed to direct users to potentially harmful content. The heuristic firings indicate that the document is intended to deceive users into clicking links that lead to malicious infrastructure, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to exploit user trust for malicious purposes.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/strik?utm_term=el+antiedipo+capitalismo+y+esquizofrenia+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_601ae2817bd43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494138/normal_6039c0f47f8ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_6039de3671053.pdfIn PDF document text
    • https://jemikarabon.weebly.com/uploads/1/3/0/8/130815017/7714494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449789/normal_6019c88f69430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5fc5f782ca79f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380536/normal_601837dc9fe34.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/6637393.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/7e0dbe17-20df-41e1-8b59-1459ea558dae/befeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b537f5e3-d780-4143-a7a6-82ca5a01daac/sigimanivonuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb38bd7-ac89-4b2c-aeea-8314ca4b0eb0/jibabiniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/493c2694-c6f0-4d7f-af50-381ca0ff1b4f/dutatarofut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6cd004-4523-434d-ad12-0979119fbebb/70184134068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88adc65e-90e4-4138-a32d-57865699a166/casio_5146_ga-110rg_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/900324c6-08df-47e2-a209-b469b22c1886/how_do_i_reset_my_kenmore_electric_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec496cc-cf4e-456f-b962-6f55a848370f/what_is_race_sociology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f5ebe5-407d-46bd-acc3-63bceed2b826/31537716303.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_off000167e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E5 5536 bytes
SHA-256: 55c090d23e7b52c767b6f91cc2b664d6735759107bb3764fa26626ebeff5ed86
font_01_sfnt_off00017ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AB7 12968 bytes
SHA-256: 061732a3f7cdabd21ac3e6ad223fb1d1ce95623a7c9de6de159f354185835b6b