Malicious PDF — malware analysis report

Static analysis result for SHA-256 a053e64c31712157…

MALICIOUS

PDF

90.7 KB Created: 2021-03-09 00:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 6d9a188d4093b91f2ebcb582305e344f SHA-1: 74b7083312ff9ebb2cb87d51171cae3a69906d7f SHA-256: a053e64c3171215736dc23788c95dc5a13a73731fd745a0623dec67a6ad8a64d
226 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external PDF URLs, many hosted on disposable domains, suggesting an attempt to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. ClamAV detection and ML classification further confirm its malicious nature.

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
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jumiwimov.ru/award?keyword=almacenamiento+en+la+nube+mega+pdf PDF link annotation
    • https://cdn.sqhk.co/kitujesijak/HiEvghv/34764464868.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/ojjo0t2/children_s_bible_stories_in_the_new_testament.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_60410fb2aa03f.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/82213560876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_6045103f41cb9.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/sejolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423431/normal_5fd09c09340cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_603b93ef00fb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406501/normal_602ad2a40f57a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5ffc0f94513ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_601dd451a73b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_4406d5ecb0094450a1e3b570b8259578.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_77f0381004c645b8880f24c87a2961b2.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_c34a3af1322f4441aef29378732ccbd8.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_a5ed09a3485a47d096f5e0b5ae4a5f10.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_c05a1fd93ab14d5eb4132447217902a2.pdf?index=trueIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_d04e384abc674394aa06a524416ba591.pdf?index=trueIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_e2b4e2897eb3431097c03fd6acc65af9.pdf?index=trueIn PDF document text
    • https://45f3941c-9845-42d6-bd7d-928b3a472ee6.filesusr.com/ugd/cdb50c_3130729b583a481bb19b7aa5f1e20a14.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 5328 bytes
SHA-256: f8a9d0037aabdf8a1bf7153407dc110a6f4eaf51a68b4d9faf6d201163e4c522
font_01_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 12660 bytes
SHA-256: 03cc4cb05ecd1acd625c4d4d8f85d7452b70ae04e52f9548434eb7ab075a1d27
font_02_sfnt_off0001454f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454F 16540 bytes
SHA-256: 06a48d8c72c771628ee10d1f60ac2cf2c89196868f6721e73269c2242f099af6

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