Malicious PDF — malware analysis report

Static analysis result for SHA-256 401b3e4253171016…

MALICIOUS

PDF

81.2 KB Created: 2021-05-22 11:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 15fa537982400d1b933cad5d5d2f9d6f SHA-1: 97248f03bb075433148636428bb108569e1ec208 SHA-256: 401b3e42531710169a91fd987047d5b46771e0e3b74ccd4f3cadaad9d348b02c
262 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to SEO-optimized PDF gateways, a common tactic for phishing and malware distribution. One prominent link, disguised as a download lure, redirects to 'https://yafferge.ru/strik?utm_term=how+to+make+a_mini_cupcake_holder', which is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+make+a+mini+cupcake+holder In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_6015ae284dd6b.pdfIn PDF document text
    • https://namuxewanazojo.weebly.com/uploads/1/3/4/2/134266474/eef8c196d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502236/normal_5fe30eecb3f0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_603c6e62e21d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_6013354f15692.pdfIn PDF document text
    • https://fazotevepokok.weebly.com/uploads/1/3/4/8/134865813/subikazaxuw.pdfIn PDF document text
    • https://fupiwopogewexab.weebly.com/uploads/1/3/4/5/134506550/sadizu.pdfIn PDF document text
    • https://fezipogapatud.weebly.com/uploads/1/3/4/8/134888370/6570648.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
    • https://s3.amazonaws.com/fonibinaraj/pulse_secure_vpn_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/tunevenafojoguxevijimum.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/reliability-centered_maintenance_rcm_is_the_engineering_technique_that.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/air_o_swiss_humidifier_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/how_to_grow_cabbage_in_zimbabwe.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/addition_word_problem_worksheets_for_preschool.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/delivery_date_meaning_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/9684836672.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/88405868609.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/participial_adjectives.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/waxuwojulaxetosajadoruwes.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/67041739451.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 5132 bytes
SHA-256: 86e9612d417c0fd77c38db3a3c92da5623e205dac04d355fdaa50cc7a2c458f8
font_01_sfnt_off00010346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 11404 bytes
SHA-256: 5db76ad9b3f7dba3ae87cb54af9fddf750e4bd7b38e790fd2150c010d7477f88
font_02_sfnt_off0001293d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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