Malicious PDF — malware analysis report

Static analysis result for SHA-256 15639167aa9ced91…

MALICIOUS

PDF

78.8 KB Created: 2021-05-21 17:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c97c9b7153cfe58dc549f8d9b479b78c SHA-1: ec153c3dcad760bc84c2b19fd91281d624ce7ed7 SHA-256: 15639167aa9ced915c29d475ca5e25a3fc999e3d991d43efde27a8f2f5d5067c
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. This URL is likely used to lure victims into downloading further malware or providing sensitive information. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to increase visibility of malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dafemum.ru/strik?utm_term=lwarb+beta+brawl+stars+download+apple In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_6049e6ed2a75e.pdfIn PDF document text
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/xerepanakekaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461763/normal_5fe4135421ad0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486765/normal_5fff57072b202.pdfIn PDF document text
    • https://zodazapel.weebly.com/uploads/1/3/4/5/134511258/letugonoviwaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_5fdc895e2caa7.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/towakog/entry_level_hr_cover_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/fudisiwebopefi.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/chidinma_fall_in_love_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/cambridge_english_grammar_test.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/45507112798.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/92411887295.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/old_yeller_dog_food_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/62728282853.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/supobakamekod.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/kreuzberg_berlin_restaurant_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/54159512212.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/17713528182.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/49376647212.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/5056281308.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_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 5128 bytes
SHA-256: 1b466ab405d7f34b8cb2f6306ed9352a46ce044e00f1eb7acfef1da375c946ff
font_01_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 11328 bytes
SHA-256: 834293693d711d13f9dff549e8668c3f59fdff2b64ef434c4aeae78688d9368d

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