Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2749d1017d53bbb…

MALICIOUS

PDF

77.5 KB Created: 2021-05-11 13:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4423954211d054fb3609c489f8de39ec SHA-1: 2c23a2d25c07990ba7fea9a417a670b99bbaba2e SHA-256: f2749d1017d53bbb8df0b60d63009396611b46581bcb844bc19a6f43a7b26e2a
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous external links, many of which point to SEO-optimized redirector domains like 'pelibifir.ru' and 'kinoxca.xyz', suggesting a phishing or malware distribution scheme. The 'SE_CLICKFIX' heuristic indicates the document likely contains instructions to trick the user into executing commands, a common social engineering tactic to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/strik?utm_term=can+you+screen+mirror+on+roku+with+iphone PDF link annotation
    • http://kinoxca.xyz/jetojufifede573ir.pdfIn PDF document text
    • https://kefejuze.weebly.com/uploads/1/3/1/6/131606268/kipugelubog-luviboroxita-zumizejud.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/ji3jdhe/86997555287.pdfIn PDF document text
    • https://seritixatot.weebly.com/uploads/1/3/1/0/131070849/83f9719dbb3.pdfIn PDF document text
    • http://arendagg.xyz/ninja_professional_blender_1000_watts_power_button_blinkingpcawf.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/9012549.pdfIn PDF document text
    • https://sajolunuweto.weebly.com/uploads/1/3/1/4/131407571/poraranesi_xukotutelaz_sobilux_besilagukizeb.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/jhhIhid/10439148462.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_2afa06b826514eb9903ea0da073bcb5b.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_f49822b5593c4f1d8d028fa982807257.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/pasosozexofetolutanif.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/jejelugegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf35827-d80b-4762-9a0c-d8336a233c4f/zorunusuturigufibux.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/jinepona.pdfIn PDF document text
    • https://4fd47d7d-96cb-4cdc-943f-55997d715fc9.filesusr.com/ugd/ab3424_283a460a7eb940d0965d069bede91d70.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_d5d0b903b0f24b0ab445b4f0288ab3fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/92516791514.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_be372ff5cb8b477fb1a393cd3a1c4ade.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a144314b-ec49-4f22-ab35-4c8c36223c18/solusedijuwumikudumipof.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/chrome_for_linux._deb.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_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 5304 bytes
SHA-256: 21df5f78cb3da6336f446c72bbe54f7074574e682df1ce395e5fe24c9176f02f
font_01_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 11004 bytes
SHA-256: 26ddb2ced61f0532d4c2f2687999dd5410133939d73a9f74c45cfd3a6b81319f