Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25fd65bdaff52fe…

MALICIOUS

PDF

83.8 KB Created: 2021-01-27 19:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d31bd06c7392ba06be5d1c1694eea4af SHA-1: 53c1894474ce8852483f03a98a9727d9e5650e08 SHA-256: e25fd65bdaff52fe6f58b9a99907d15425c7818c3152d5b73bb308685fe0c01a
244 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics as a malicious redirector and link farm, indicating a phishing or SEO poisoning campaign. The embedded URLs, such as https://yafferge.ru/aws?utm_term=reticular+formation+brain+made+simple, are likely used to direct users to malicious sites. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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/aws?utm_term=reticular+formation+brain+made+simple In PDF document text
    • https://cdn.sqhk.co/tinupolureg/hficvih/newitexokino.pdfIn PDF document text
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/keturabel.pdfIn PDF document text
    • https://xavuzilutose.weebly.com/uploads/1/3/1/0/131070872/9456620.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/iPfWhcx/58345076672.pdfIn PDF document text
    • http://frankiearvelo.com/pcl_r_test4thj4.pdfIn PDF document text
    • https://cdn.sqhk.co/tumakakebi/GXjgtH8/world_market_dining_table_marble.pdfIn PDF document text
    • https://wikafifej.weebly.com/uploads/1/3/2/8/132815388/8484750.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/5142013.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/JFZPyjf/vovuzudejo.pdfIn PDF document text
    • http://boldly-grow.com/rhythm_city_18_september_2020_full_episode51yu2.pdfIn PDF document text
    • http://proflist-kursk.ru/95069381509qibxu.pdfIn PDF document text
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/4ecf2a681.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/fhiYIig/81430331990.pdfIn PDF document text
    • http://axecheat7.xyz/modal_verbs_of_obligation_exercisekocv1.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/dogmji7/9969376070.pdfIn PDF document text
    • http://missunik.space/79688047487nnezi.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
    • 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_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 5328 bytes
SHA-256: 0e65a33b4bf1abe16dc950fc2971f5e1c95d00f005f283646a9992da5d1c9c2e
font_01_sfnt_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 10408 bytes
SHA-256: 12ea1638fc9560b16b5cbb6aa98d5ff33a2fd047ef25a6b0570e58ce959e4401
font_02_sfnt_off00013245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13245 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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