Malicious PDF — malware analysis report

Static analysis result for SHA-256 317d0e61862d5209…

MALICIOUS

PDF

75.6 KB Created: 2021-03-29 12:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0fb6d3425e394ffc4ce789f126f84a93 SHA-1: e90a61b5b07b2584bc53014092277e98036d81d1 SHA-256: 317d0e61862d5209a4ed1affd6d9ccea9aaedab4efe6bcf3549537669cabb392
244 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. One of the primary links directs to 'https://yafferge.ru/strik', which is flagged as malicious infrastructure. The document body, though heavily obfuscated, appears to contain metadata related to a UPS issue, likely a lure to disguise the malicious intent of the embedded links. No scripts were extracted, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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=apc+smart+ups+1000+wont+turn+on In PDF document text
    • http://googsnat.space/red_parrot_birds_images_freegr031.pdfIn PDF document text
    • http://teagreen.space/ligebufofozujarezupatusejy49v.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/e5gdnhe/nasetutokexa.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/Wifj19L/7979789319.pdfIn PDF document text
    • https://nafesidupige.weebly.com/uploads/1/3/2/6/132680955/5d61e059443.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/17291723040rhj2q.pdfIn PDF document text
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/15dff34467.pdfIn PDF document text
    • http://glossywp.online/26156780021ycuwx.pdfIn PDF document text
    • http://teaapple.space/biomassa_para_energia_corteznsnav.pdfIn PDF document text
    • https://cdn.sqhk.co/kutagigixef/f6sYgiI/autocad_lt_2014_32_bit.pdfIn PDF document text
    • http://itnegozio.info/satuluwisfqz6.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/introduction_to_business_ethics_and_social_responsibility_ppt.pdfIn PDF document text
    • http://kersita.space/gopakiponuwomokabze3p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78f121e6-5824-477f-9480-4bf23eba804c.filesusr.com/ugd/9564ad_60aab9f2e25f4e55b05386a7da7db464.pdf?index=trueIn PDF document text
    • http://visugog.myartsonline.com/xigamejidiwunopijamoxa.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_f1f346e81da64e80960dffec52dd8259.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_fc1ad87bcd7346fc888bedd9ccb5b719.pdf?index=trueIn 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_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 5320 bytes
SHA-256: c5a04e3c8e89d6046cc59db253bae85b2a92948fd48edf26942b31c13a4b88f7
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 10652 bytes
SHA-256: 0056e68eaf8f1a1c11945da80ac7aa95cefed5e86c7bd7948101ce81d29b1058

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