Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a090a373a39f2c3…

MALICIOUS

PDF

84.4 KB Created: 2021-05-09 05:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b971db37b0bfe0e34d123210462f19b2 SHA-1: 277a3b936532c9921d4d7aa0694a4caf579e87e3 SHA-256: 8a090a373a39f2c3c9a5bfb0e10cd56624bf35285525460907391056b5634b7d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, characteristic of a link farm or phishing campaign, aiming to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to exploit users through deceptive content, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/strik?utm_term=hp+compaq+elite+8300+motherboard+specs
    • http://tenipimutav.mywebcommunity.org/58163693508.pdf
    • https://wovigapugup.weebly.com/uploads/1/3/2/7/132710676/7163689.pdf
    • https://static.s123-cdn-static.com/uploads/4496193/normal_5fed42422b6df.pdf
    • https://cdn-cms.f-static.net/uploads/4376625/normal_600d87b8a3f2d.pdf
    • https://pefuwopiluja.weebly.com/uploads/1/3/4/5/134592541/425965.pdf
    • http://dapajurop.mygamesonline.org/fewagodemuroxatuvajekitem.pdf
    • https://cdn-cms.f-static.net/uploads/4505096/normal_5fdc74bdc5a4e.pdf
    • https://cdn-cms.f-static.net/uploads/4403143/normal_602c6a16a6d95.pdf
    • https://cdn-cms.f-static.net/uploads/4448991/normal_60210f61619cd.pdf
    • https://cdn-cms.f-static.net/uploads/4475194/normal_603a972f9d2cb.pdf
    • https://kibepujuvug.weebly.com/uploads/1/3/4/6/134644113/7752814.pdf
    • http://xanejog.medianewsonline.com/bipawavixizezisa.pdf
    • https://cdn-cms.f-static.net/uploads/4451049/normal_6031d6592a83b.pdf
    • https://static.s123-cdn-static.com/uploads/4480897/normal_5fec2c7970b9b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1996985e-a515-461b-859c-6c1ebf894fd7/xebitituge.pdf
    • https://uploads.strikinglycdn.com/files/bf2b449a-25e0-4b69-a048-8bb3081c62c6/briggs_and_stratton_replacement_parts_near_me.pdf
    • https://uploads.strikinglycdn.com/files/fce3c947-fd32-4c23-962b-a1608f9e3d11/bosch_800_series_stackable_washer_and_dryer.pdf
    • http://nakixaxev.myartsonline.com/design_as_art_bruno_munari_espaol.pdf
    • https://uploads.strikinglycdn.com/files/b67694ef-4fa3-414f-87bc-3ebba3c52309/39993950463.pdf
    • https://uploads.strikinglycdn.com/files/575dff24-173c-4fd3-adf9-ebb595acad7c/how_to_program_comcast_remote_to_sony_tv.pdf
    • https://uploads.strikinglycdn.com/files/f2601eea-a4de-40f8-81e4-0656363ce577/yamaha_motif_xf8_manual_espaol.pdf
    • https://uploads.strikinglycdn.com/files/540cb33c-4614-4ff1-83b2-2d88ee9eea47/faber_piano_adventures_lesson_book_level_5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb57.bin
d1f209e1cca572c64c992974d6819846b30ad293edc4f3c376ad1df891995c70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 5720 bytes
font_01_sfnt_off00010eb3.bin
239ff6bf609f1a3635c8f953bdeec9e6d42adfa0f4470e66c9d7b9097d32853e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 11616 bytes
font_02_sfnt_off00013615.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13615 4324 bytes

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