Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a7d4f613d6a808…

MALICIOUS

PDF

72.4 KB Created: 2021-04-30 03:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11d4bd152b57debc2238f3aafa12a12c SHA-1: c214bfde633dbb0c0cc52b8fa422ccafad635cd6 SHA-256: 42a7d4f613d6a8087d2698333f0b417f7ebb551d3546e781c98b5f8b3b934f75
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded links, including a significant link farm, suggesting an attempt to direct users to malicious websites. The document body, though heavily obfuscated, contains text related to vehicle wiring schematics, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=how+to+read+vehicle+wiring+schematics
    • http://rejorevubirobu.sportsontheweb.net/bofosomafufosum.pdf
    • https://cdn-cms.f-static.net/uploads/4445869/normal_60403b196a1f7.pdf
    • https://cdn-cms.f-static.net/uploads/4408589/normal_6025f8a1f3970.pdf
    • http://bagawixaj.mywebcommunity.org/9126831054.pdf
    • http://takovevagagiv.scienceontheweb.net/toxekamabesetar.pdf
    • http://serururepus.scienceontheweb.net/88889797168.pdf
    • https://static.s123-cdn-static.com/uploads/4419194/normal_5ff14da2669d8.pdf
    • https://cdn-cms.f-static.net/uploads/4408180/normal_601d684c4d95c.pdf
    • https://cdn-cms.f-static.net/uploads/4491688/normal_6065296cdd140.pdf
    • https://static.s123-cdn-static.com/uploads/4410433/normal_5fcc806b67d24.pdf
    • http://jaxifas.getenjoyment.net/catia_v5_freestyle_tutorial.pdf
    • https://cdn-cms.f-static.net/uploads/4371791/normal_602620ac8333e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_47ca8b2449474f5da015b3a969503e41.pdf?index=true
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_f0f235cd2b934ea8a9256c83d9d7078b.pdf?index=true
    • https://8607b5f8-c2b2-49b7-a314-b17bd4efff40.filesusr.com/ugd/d99252_151858cf5d6445258e480408f34ab199.pdf?index=true
    • https://s3.amazonaws.com/feliso/friendship_belt_images.pdf
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_ca064633947a4d2c81769df800d3309f.pdf?index=true
    • https://f7927488-8152-43cb-a667-e231f58cc5c5.filesusr.com/ugd/950cc9_72b8bffca30a4c96a890d607929b4087.pdf?index=true
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_78ae8bc4ffa74b9ab8d3e601a857c008.pdf?index=true
    • https://s3.amazonaws.com/xedewofuretujo/25097703489.pdf
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_2f078186e64e4169acbac34d1b905145.pdf?index=true
    • https://c11a947b-b5de-40d6-aa91-47d67080e008.filesusr.com/ugd/a64c8c_e8cfedbe50cf44bc83f1cc3a08778388.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc8.bin
fd0542ce88a9845ce57b5ee0e8c50ff18795c5a1482df0596f209f8b7a092721		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 5464 bytes
font_01_sfnt_off0000f24b.bin
43978d8615eae1544fa6ca5dbb8045d5fb78350eda11b4ea8c5b2249d9cdd003		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 9848 bytes

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