Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfdadf2926497e8…

MALICIOUS

PDF

81.0 KB Created: 2021-03-14 10:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c696a72e73907100293f7d1422448736 SHA-1: 7e44b95f27dcb190c7280bcdb537dbf8c13b6bc1 SHA-256: 3dfdadf2926497e82a417cccc3f8ff392bc49695e81e30a9d4b5fabaab4dc943
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a significant number of generated SEO links pointing to PDF files on various domains, indicating a link farm or redirection scheme. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The embedded URLs likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=dyson+dc50+cleaning
    • http://rijewomel.scienceontheweb.net/87468586806.pdf
    • http://gagitevanonuti.mywebcommunity.org/62505887339.pdf
    • https://cdn-cms.f-static.net/uploads/4450731/normal_5fd2f5d90b6bb.pdf
    • https://cdn-cms.f-static.net/uploads/4417029/normal_602af5f3eaed9.pdf
    • https://cdn-cms.f-static.net/uploads/4486987/normal_60148595d5ec0.pdf
    • http://wojesukuzak.mygamesonline.org/ditowofejixazulosa.pdf
    • https://piminudoligot.weebly.com/uploads/1/3/4/6/134688392/gamuri.pdf
    • https://static.s123-cdn-static.com/uploads/4408352/normal_5ff2f33492973.pdf
    • https://cdn-cms.f-static.net/uploads/4382961/normal_5fd8fc9796c57.pdf
    • https://cdn-cms.f-static.net/uploads/4505363/normal_5fd9193c10e32.pdf
    • https://febumade.weebly.com/uploads/1/3/4/7/134757335/49f5493d3a377.pdf
    • https://cdn-cms.f-static.net/uploads/4453118/normal_600cf213e9c31.pdf
    • https://cdn-cms.f-static.net/uploads/4420248/normal_5fe7bbb5505f5.pdf
    • https://cdn-cms.f-static.net/uploads/4388818/normal_60337cbb77133.pdf
    • https://cdn-cms.f-static.net/uploads/4374009/normal_604d18aa94d76.pdf
    • https://cdn-cms.f-static.net/uploads/4470833/normal_600a292d1a1c8.pdf
    • https://static.s123-cdn-static.com/uploads/4417408/normal_5fee1b2251e51.pdf
    • http://xilatotes.sportsontheweb.net/klipsch_r-10b_no_sound.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gagagakigibapo/59060289371.pdf
    • https://s3.amazonaws.com/jupudizadid/811556875.pdf
    • https://s3.amazonaws.com/wunupalezozerud/neoprene_gloves_chemical_resistance_guide.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c6.bin
7cf67d6458de26f67aaa62501dea97b31cf6d4bd3d8ec1a9f2d832e719c5874d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 5088 bytes
font_01_sfnt_off0000f71c.bin
0b2b93d9a33bea114ed67df8e8bcde093a6f6f15a1698783125a23d27215fe7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 2712 bytes
font_02_sfnt_off000102b9.bin
c8c2451b4537a18efa81d5173ff2da1c4764935fc7dea8577da529beba4cbfc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 10828 bytes
font_03_sfnt_off000127e1.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127E1 4324 bytes

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