Malicious PDF — malware analysis report

Static analysis result for SHA-256 76324a55969564b8…

MALICIOUS

PDF

90.8 KB Created: 2021-05-31 11:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 223f200a93b4e4970f7171721295aea3 SHA-1: 4d2075e8ec24adbd63c4d04e4a91425d312e8605 SHA-256: 76324a55969564b8eb67ad7502182fa7025b1d88a15b5a8177dacf1771c74638
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a malicious URL leading to a phishing attempt disguised as a book download. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

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://midufefew.ru/123?utm_term=adverse+drug+reaction+book+pdf
    • https://cdn-cms.f-static.net/uploads/4481663/normal_6021104d6db57.pdf
    • https://cdn-cms.f-static.net/uploads/4487413/normal_5fd8fabd130b1.pdf
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5ffac92bd20c7.pdf
    • https://cdn-cms.f-static.net/uploads/4384048/normal_605675c309593.pdf
    • https://static.s123-cdn-static.com/uploads/4368758/normal_5fc62f34cf87e.pdf
    • https://cdn-cms.f-static.net/uploads/4391008/normal_602392898c34e.pdf
    • https://static.s123-cdn-static.com/uploads/4459337/normal_5ff4982bd5c69.pdf
    • https://static.s123-cdn-static.com/uploads/4389394/normal_6003b0b278ec6.pdf
    • https://tajulariti.weebly.com/uploads/1/3/4/8/134863193/c6a99a5.pdf
    • https://sazigusejif.weebly.com/uploads/1/3/4/7/134771803/guradikixubu.pdf
    • https://pezobarifad.weebly.com/uploads/1/3/5/3/135394950/wipiwupirikit.pdf
    • https://sovakevu.weebly.com/uploads/1/3/4/3/134341498/699801.pdf
    • https://cdn-cms.f-static.net/uploads/4378175/normal_6015c561be3a9.pdf
    • https://zipemulobob.weebly.com/uploads/1/3/4/5/134528333/borexu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5ae5c797-9a14-428a-82ba-0dd4a09f2269/how_to_control_and_manage_your_anger.pdf
    • https://uploads.strikinglycdn.com/files/a4216665-46f5-46e4-9776-d9a24c6b7a91/46996868487.pdf
    • https://uploads.strikinglycdn.com/files/2dd19631-3db8-498b-af48-d46495c6c65c/xexotemasunodamigixoxuvo.pdf
    • https://uploads.strikinglycdn.com/files/629e8725-5f01-433d-8034-55c9e5d9cca8/putejoravojasipetazofofad.pdf
    • https://uploads.strikinglycdn.com/files/def0e372-d418-4419-867c-f7f1f5f971dc/26380398798.pdf
    • https://uploads.strikinglycdn.com/files/76fa3f34-b2aa-4856-97ea-f0ff87cd29b4/nexagutesitixizoga.pdf
    • https://uploads.strikinglycdn.com/files/0fb4d898-0ee2-479e-841e-a202a3a71f55/krk_rokit_5_g4_price.pdf
    • https://uploads.strikinglycdn.com/files/5a6cebf8-139c-40b8-9524-138d0bc65ee6/nizopizaduvejew.pdf
    • https://uploads.strikinglycdn.com/files/0aec4453-77ec-4880-ac0d-2d1aba268c46/81750023436.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001218d.bin
69e43a4b681985b71071829334b92bbbbe2ab19600c98c0a6719347457f729d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 5544 bytes
font_01_sfnt_off0001347d.bin
443abce892ac6d53cf73a4c45f00a4d293033bf4391e50c7e5549dbad18aa769
pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 12524 bytes