Malicious PDF — malware analysis report

Static analysis result for SHA-256 08713dcba6fc639f…

MALICIOUS

PDF

78.1 KB Created: 2021-05-22 14:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c202870b3578997d6900b245f000b82 SHA-1: e85caca13b9b975fa2c70e9ecc7a779643ed8bce SHA-256: 08713dcba6fc639f63ec3423f08694f23bd00934078ab6717c8ac53794b7ffb8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://maypoin.ru/strik?utm_term=is+should+a+modal+verbs+of+possibility
    • https://vutitikanok.weebly.com/uploads/1/3/4/7/134774074/kogobapidom.pdf
    • https://mujaxelixoduren.weebly.com/uploads/1/3/3/9/133997177/6976461.pdf
    • https://cdn-cms.f-static.net/uploads/4473926/normal_6057b5999ea69.pdf
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/4fb631708.pdf
    • https://cdn-cms.f-static.net/uploads/4393754/normal_60309d2000577.pdf
    • https://cdn-cms.f-static.net/uploads/4446273/normal_604a30cd34e93.pdf
    • https://static.s123-cdn-static.com/uploads/4369775/normal_5fdd87a7e43b3.pdf
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5ff09551dda82.pdf
    • https://cdn-cms.f-static.net/uploads/4459025/normal_60273d6c5d1ac.pdf
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5ff61363688af.pdf
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/fuwanuf.pdf
    • https://static.s123-cdn-static.com/uploads/4385010/normal_5fcc5e5564c01.pdf
    • https://tenubufaz.weebly.com/uploads/1/3/1/1/131164261/luxopitowegevin-zesekunuvow-merotowoz.pdf
    • https://static.s123-cdn-static.com/uploads/4450502/normal_60038ecbf3b86.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9ee67f1d-4319-4c99-ad02-a92f030d2039/66401678034.pdf
    • https://uploads.strikinglycdn.com/files/c6ccdf56-c051-4beb-a1d4-1363fadf1c14/what_happens_at_a_psychiatric_assessment_uk.pdf
    • https://s3.amazonaws.com/lakadutof/how_to_follow_hedge_fund_trades.pdf
    • https://s3.amazonaws.com/lupebesu/poulan_electric_chainsaw_parts_pln3516f.pdf
    • https://uploads.strikinglycdn.com/files/62f55ef9-f7b7-440e-9a96-5ceb1b52360a/42498240020.pdf
    • https://uploads.strikinglycdn.com/files/6abb4db4-32ba-42f4-bdf6-58349bf225fc/theta_healing_meditation_vianna.pdf
    • https://uploads.strikinglycdn.com/files/369979c8-4a54-4656-91d8-e5c3f58c3701/2012_jeep_grand_cherokee_for_sale_craigslist.pdf
    • https://s3.amazonaws.com/tiduro/sql_server_developer_edition_iso.pdf
    • https://uploads.strikinglycdn.com/files/550c5cda-e868-49f9-b6a3-9e307c3f73f0/joxisojomal.pdf
    • https://s3.amazonaws.com/luborinizu/nunefijeke.pdf
    • https://uploads.strikinglycdn.com/files/a92ff686-c09a-4fc9-bdc0-88097ce51f62/abdul_kalam_agni_siragugal_book_in_tamil_free_download.pdf
    • https://uploads.strikinglycdn.com/files/fd3432c8-0ab7-4353-b0fb-048eb6303350/nutop.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_off0000f305.bin
628cdb44f4b0eb71997c138e2c56820d54183e044039f15354d0a3e09585e0a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 5520 bytes
font_01_sfnt_off000105a1.bin
00956e37af47e5e1020eeb47d0847223cc57f24da3280f6c850e706ab10479fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 10452 bytes

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