Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d10fe23d322e12…

MALICIOUS

PDF

68.7 KB Created: 2021-05-10 00:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 790c9aed817b5044bd26b3e82a2bbe35 SHA-1: a6465102d2ba55840329da6ce56db281c9f7133d SHA-256: a1d10fe23d322e12f60a0acd18143a0672abc110035f44344ef7f2267a506be0
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm with numerous external PDF links, one of which is a suspicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=python+range+float+increment
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5fe651a4604fc.pdf
    • http://resukagewa.22web.org/mibiv.pdf
    • http://vorusobowa.66ghz.com/wajunuginiju.pdf
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6032b92eccf93.pdf
    • https://cdn-cms.f-static.net/uploads/4414677/normal_601e5f14ef872.pdf
    • https://cdn-cms.f-static.net/uploads/4426413/normal_6063d0e015d19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_443a1303c063441fa325736933e4bc04.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c90fdc3a-2b04-40ed-bbf1-976031fa3fd5/20162474560.pdf
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_feb2abbc22974c36924e7d5d9f947e81.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ba1d08b8-e9e5-4d46-ba6d-615ec03beeb9/is_the_summer_i_turned_pretty_a_movie.pdf
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_08005613a9294aabb3f4eb966ebc6f4d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2dfa5eb4-17fa-43d0-8598-b125c296424d/hyperion_dan_simmons_amazon.pdf
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_66663ff866ce4ef68e47586418cebe62.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0f32307c-b9df-429a-ac51-70b72bfdbe9a/homelite_leaf_blower_gas_cap.pdf
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_4de498249d574e818a59dfba7c25abad.pdf?index=true
    • https://8c330184-3457-40de-b162-e34763a77ed1.filesusr.com/ugd/0aae61_829677f3546e4e3d93199342aa4e8046.pdf?index=true
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_19bff63493d5418cac0e77aff3c79400.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fc70f124-070f-4cb6-9dd2-cb6ae24b7b1a/fedebazumalikefudamis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf7c.bin
36b75078e2df2f48a1c0e245a1745b75eaa804acb8cd21f07cbf363849736995		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 5220 bytes
font_01_sfnt_off0000e127.bin
3b9f4408873723bf50e7921c5c20bf49809162f620b602f923a2963df3ccb1b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 10664 bytes

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