Malicious PDF — malware analysis report

Static analysis result for SHA-256 beef15f19772bf3e…

MALICIOUS

PDF

80.8 KB Created: 2021-04-07 03:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 45f82490917bd123a909c673ff5f496b SHA-1: eb96aa3005c3f8865f0f6ad97c3539384543b163 SHA-256: beef15f19772bf3e13444dc9029abbc36a626a5df5a09e5a5ae9e1041e7dffd9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=soleus+air+conditioner+and+heater PDF link annotation
    • https://cdn.sqhk.co/nimabugokofa/InDTUhg/the_pro_forma_net_income.pdfIn PDF document text
    • https://zuzoperelalame.weebly.com/uploads/1/3/2/6/132683259/7012461.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/likujenimateru.pdfIn PDF document text
    • http://luzikudejijes.22web.org/birixe.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/wide_ruled_loose_leaf_paper.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/5057226.pdfIn PDF document text
    • http://daxamel.mywebcommunity.org/berifitebibowuva.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/ieqijcp/hip_hop_pads_apk_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_7bba43be2cfc463ba54baa227c4b4272.pdf?index=trueIn PDF document text
    • http://lefamuredemupi.epizy.com/mepujubugeg.pdfIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_04dc20133a844604af174efcd7c5233c.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_b481954def2341f2abf5ab45949a7985.pdf?index=trueIn PDF document text
    • http://wadoromutisagar.myartsonline.com/49910032617.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_0b0e808d76f64145970b5fa14ea92828.pdf?index=trueIn PDF document text
    • http://bavufupuvamopaf.atwebpages.com/fizalik.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_70eccdbacb42410daee7723f15fbd7c8.pdf?index=trueIn PDF document text
    • http://sonatufekofefab.rf.gd/selosozovodovitesududi.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_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 5128 bytes
SHA-256: a5273b13b4e0b5fc7ba362d251501a5f9fbcce5d64aadc6dbf93a0e43a63fd10
font_01_sfnt_off00011002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 11092 bytes
SHA-256: b77e7b0d95a6aab6ab2c857f303a4247e419aa18cf4643de44ad1398ba6fdc58

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