Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd5ff97b9406de4…

MALICIOUS

PDF

80.6 KB Created: 2021-03-14 00:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3153d5f9be9c827ef12edc4b6c915ab SHA-1: a1c2d91857cf058ce67d3f93fec492aabab29410 SHA-256: 1dd5ff97b9406de4f9428fd195d94dfbf93fcc1687c9abe76687ed4a9360c36c
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, with numerous external PDF links. One of the embedded URLs, 'https://botokaw.ru/123?utm_term=ps2+emulator+for+android+5.+1.+1', is presented in a way that suggests a search result lure. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

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://botokaw.ru/123?utm_term=ps2+emulator+for+android+5.+1.+1
    • https://cdn-cms.f-static.net/uploads/4450351/normal_602f827cba893.pdf
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/5772960.pdf
    • http://zasosidimul.22web.org/how_to_repair_asko_dishwasher.pdf
    • https://mibudixu.weebly.com/uploads/1/3/4/4/134490534/a3097b1cc85.pdf
    • https://static.s123-cdn-static.com/uploads/4370762/normal_60029716b3a5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_67bbbc3e9f4841518316cb2122ef2fbe.pdf?index=true
    • http://maguzuj.rf.gd/what_does_economic_sanctions_mean.pdf
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_fbc377cff057420eb42a746661b12898.pdf?index=true
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_550d274f23114f6e8e993491524f542d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cdd40f07-7ca9-48ae-bb12-c6106b022615/stochastic_finite_element_method_matlab_code.pdf
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_8173c327f13449239756a6ce20c09882.pdf?index=true
    • https://uploads.strikinglycdn.com/files/58763698-2713-4c91-80e4-9495d3316f76/33942634880.pdf
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_4e3a92e089a44400b0b0e4a9ab09a2ca.pdf?index=true
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_347a6f62468a4432a648b5a4823437f4.pdf?index=true
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_c4b6e1ec8c0b4e5ea73be403564fcb1c.pdf?index=true
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_63ae96437c1040ac95d411c9a3a52efb.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef62.bin
80bcb29a909bddbbc1b4a3da8fefb1f0f144dd187c0904c9fe24b09fd1d06905		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 5276 bytes
font_01_sfnt_off00010145.bin
c4791461812eb753134b4c0ed97f481f45574b5a583c7875758b394d89bdd960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 11512 bytes
font_02_sfnt_off00012769.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 4324 bytes

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