Malicious PDF — malware analysis report

Static analysis result for SHA-256 836a136d20ebe24a…

MALICIOUS

PDF

69.7 KB Created: 2020-11-14 10:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76ba0903b759b5a960f7a134aac7980a SHA-1: 2851bb4a81209f9127c2f808dda4d749c090b16b SHA-256: 836a136d20ebe24ab195e6809c94838694f5425100f0edd582b5b17f6e0670cd
214 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating malicious redirection and a link farm, with a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs, particularly 'https://traffmen.ru/aws?utm_term=boxed+book+font+free', suggest an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=boxed+book+font+free
    • https://bivitomelonex.weebly.com/uploads/1/3/4/4/134491730/demuluzuti.pdf
    • https://cdn-cms.f-static.net/uploads/4419193/normal_5f9abfa18f0c8.pdf
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5f8f9bacd0683.pdf
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/zugedirixunikokon.pdf
    • https://guzifako.weebly.com/uploads/1/3/4/0/134096492/5381330.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/damerirazib/common_objects_that_are_red.pdf
    • https://s3.amazonaws.com/fikuvine/csipsimple_apk_download.pdf
    • https://s3.amazonaws.com/ropuba/55637955480.pdf
    • https://s3.amazonaws.com/banula/burger_bistro_hazelwood_menu.pdf
    • https://s3.amazonaws.com/wanalovum/mepotawifasuzagavufo.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/75386233244.pdf
    • https://s3.amazonaws.com/megodipewukitoj/walmart_grocery.com_delivery.pdf
    • https://s3.amazonaws.com/jeduzizonox/fosigawiwiwipodoku.pdf
    • https://s3.amazonaws.com/pululusodogi/37841648197.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c5.bin
2a15717b164ee10642855039eaa3a6e9524a6ffe5b50161992ea66bef91609f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 4540 bytes
font_01_sfnt_off0000d63c.bin
cce5b532c88aae0c633eba6d1a65d4175d4eaa09512086c58be53b83fda101ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 11152 bytes
font_02_sfnt_off0000fc21.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 4324 bytes

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