Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18d3b63a9ff0b21…

MALICIOUS

PDF

77.0 KB Created: 2021-05-18 23:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 78fae5137d5e0b237eca05d0bc5c2006 SHA-1: d6ef1d19e5588889ce4a8f2ab6468909f70fee06 SHA-256: d18d3b63a9ff0b21d9eae60d1049ad4108a3ca2fc8ac8bbf5765255bb67fefe6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, and the ClamAV detection as Pdf.Phishing.Trojan strongly suggests malicious intent. The primary URL, https://nipisod.ru/strik?utm_term=how+to+treat+osteomyelitis+at+home, appears to be the main lure, directing users to a site related to medical treatment, likely to deceive them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=how+to+treat+osteomyelitis+at+home PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479460/normal_601b28c667b0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369496/normal_5fc9f1140af4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450502/normal_6033d04a01f3f.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/tusebokexafe-wupalenifi-gegama-benewo.pdfIn PDF document text
    • https://goxepafanaba.weebly.com/uploads/1/3/0/7/130739763/189213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_600c65ae7d2a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcf609f4a729.pdfIn PDF document text
    • https://sifuzulujiw.weebly.com/uploads/1/3/4/7/134716539/0895fb88.pdfIn PDF document text
    • https://fiwaluveniwob.weebly.com/uploads/1/3/5/3/135395264/3079670.pdfIn PDF document text
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/puleso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409623/normal_6002f47523bed.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/runezorofugis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370285/normal_5fc5db5b648da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5ff6ae81e6b50.pdfIn PDF document text
    • https://fibusoza.weebly.com/uploads/1/3/0/7/130775704/dakom_dakasikenol_bolupizux_lejopuleseneta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/45194934443.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/how_to_determine_condensed_electron_configuration.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/what_size_chest_freezer_is_best.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/amscot_money_order_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/calendario_liturgico_2018_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/causative_verbs_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/zinoxol.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/android_app_splash_screen_example.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/do_midi_to_usb_cables_work.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/93427417039.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 5080 bytes
SHA-256: f3bc95613c610116887f859e8154edc70c5d5af7d354a89c60664b6a70cb6873
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 10956 bytes
SHA-256: c6b17d4846d3851b653fb982b69468ad97cddf6dcb041d04b15437bd9fb0dfb9

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