Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58c76304630ed03…

MALICIOUS

PDF

97.2 KB Created: 2021-03-08 11:02:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a0074b3ae8fa6dcb9726f2d487a131e1 SHA-1: f7f39d4ac792a46093315498eed26637493ddd8f SHA-256: d58c76304630ed03fadc888a5bc8900793c9b54bbfa72a40686a7d23e7220f5c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm. The primary URL, 'https://pelibifir.ru/strik?utm_term=rewrite+equations+in+slope+intercept+form+worksheet', is likely part of this scheme to drive traffic. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or ad-revenue generation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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=rewrite+equations+in+slope+intercept+form+worksheet PDF link annotation
    • http://janurikemodowu.iblogger.org/bigexukuzixakuzapugi.pdfIn PDF document text
    • https://cdn.sqhk.co/wozobifanu/a92PGt2/cnc_lathe_machine_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_6015b8577dc78.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/jef6b7Y/lebara_germany_balance_check.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_603752173c0a3.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/icie4gh/glory_road_movie_ending.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469827/normal_5ff667cd05a7e.pdfIn PDF document text
    • http://gutaferu.22web.org/clash_of_kings_mod_apk_unlimited_everything.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://uploads.strikinglycdn.com/files/24d9a437-2897-4b9a-8135-473ffebf0b2e/38885561046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000dc8fa-5a98-476e-8d99-3167dd5cfc96/76598499150.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_96841906d7254ca1b5f3bf4fd84a2823.pdf?index=trueIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_693246488de14ec0b7bc333be3db5cf1.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_9be4e84b6e2f4b7a931b7ca2eaa40e1e.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_e361cc8815ad420c87982dfe2559cea0.pdf?index=trueIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_48b6ea0aa85f4e728ec668f71b8ed92a.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_c19250b41e0e487e955b005736935553.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f897f2f6-c8e3-47fc-a0b4-5ec4d318b19b/wimesatin.pdfIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_a9bd9f4d0ac64c6a93d68c77720ea495.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_6cd832230bfd4443ac8de6acf7a5a3c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44239bf-248b-4756-a4e3-335f07f262ce/wekufuxaverole.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 5424 bytes
SHA-256: 730534a92fd20d0b7d15ba705e5f923fea0e07eb442b13c24e50b97553754956
font_01_sfnt_off00012b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 11684 bytes
SHA-256: 9c2f01d7d94a6cd9ed4d9e4b18856e5fd5b0cabdb4eb3c451f905ba21595a63d
font_02_sfnt_off000153a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A6 16120 bytes
SHA-256: afef7078cb2df19c3af6e0a290a1e91943695396d6c8eacc2b40ed28c0b27951
font_03_sfnt_off00016891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16891 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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