Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0862dc3467f1520…

MALICIOUS

PDF

139.8 KB Created: 2021-03-12 07:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4bf6cf0ae93b173de68f4913b2c9234c SHA-1: 61063f28d5471537b6a757610df5e3346d4a61a4 SHA-256: a0862dc3467f1520ea60d57a3e16bca655dba8a436bacb1d2d106dc400f78fd9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML heuristics identify this PDF as malicious, specifically a phishing or trojan variant. While no scripts were directly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/award?keyword=boolean+logic+operators+pdf PDF link annotation
    • http://rentline.pro/42192975615yoptn.pdfIn PDF document text
    • https://nugiwilog.weebly.com/uploads/1/3/1/3/131384260/xanovimopajapiw_sixez_motis.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/lrKb3cc/36635428562.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_5ff07a0f5c2df.pdfIn PDF document text
    • https://nonadokemiraf.weebly.com/uploads/1/3/0/9/130969568/4011b.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/PhejhXt/fuxevunotuxamuti.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/hijqghg/line_graph_template_ks2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387035/normal_5fefbf6425106.pdfIn PDF document text
    • http://enots.space/aiden_witcher_37u059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_5fd67dd1bde45.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/tavulaxol-gezinenipup-nifimuravar-zixizal.pdfIn PDF document text
    • https://topudikuwem.weebly.com/uploads/1/3/4/0/134042537/4414007.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/guNl4kV/coins._ph_wallet_log_in.pdfIn PDF document text
    • https://dexatasudawuge.weebly.com/uploads/1/3/4/4/134477966/8576461.pdfIn PDF document text
    • http://rameautbxy.space/311834240976m9gg.pdfIn PDF document text
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/34376.pdfIn PDF document text
    • https://xivexibajewubud.weebly.com/uploads/1/3/1/0/131069970/fupusaz-tiretepifagif-xifonitexo.pdfIn PDF document text
    • http://madewithsunshine.com/sivafilufodidipuqe972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fab1df71-25d1-4acd-a800-517e9b418ba7/how_to_fill_hoover_dual_power_max.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60744f96-169a-49ba-ba1d-f84b80514b22/bosch_500_series_dishwasher_shpm65z55n_lowes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3283d2fe-aa55-47d1-8bf2-7e239344f25a/94808690013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad15d426-c689-4ecd-b9f8-e05497e9d78d/57580238253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e87009-5cfd-4a2e-adf4-fe47bf4b4a2d/does_oxygen_damage_cells.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B930 5160 bytes
SHA-256: 805cf9caf49ffecc879256c016007cbd1471ed0fa54d6db5c3d29e0423d27a22
font_01_sfnt_off0001cac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAC2 15472 bytes
SHA-256: 3f655ee3ca129a1c709db23db0bdbc038dbb62374c9c7c76678df3c8f097c0fc
font_02_sfnt_off0001fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBFF 16560 bytes
SHA-256: 4dd2916559f34819719cd61b2f872ce946149feef750b0e8dcda1bdbcc952dcf
font_03_sfnt_off0002129e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2129E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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