Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe107a625c48cd5e…

MALICIOUS

PDF

77.7 KB Created: 2021-04-03 16:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b305a0c1db3096e5391bc70b6e3c0780 SHA-1: ce84d1c404754155672cfb8391a4d7cdfa5565c6 SHA-256: fe107a625c48cd5e44c66a1b35d3c57afe9c6fa509b73f37ebd03bf6ea44cf46
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector URL (https://zajinet.ru/strik?utm_term=nikon+coolpix+p510+lenses). This indicates a link farm or phishing attempt designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/strik?utm_term=nikon+coolpix+p510+lenses PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486053/normal_5fca3c20417ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454809/normal_6064c64719a2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_604b0710e8751.pdfIn PDF document text
    • http://fakts.design/dodokozulazulopezar6od0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491437/normal_5fc9bba45e1e3.pdfIn PDF document text
    • http://spiritstudio.ru/784437440641swd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d729bdc7-f906-43a0-88bd-fb3a777ad6a9/11377378587.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/diary_of_a_wimpy_kid_the_long_haul_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6110fcc4-57fa-47a9-a88e-4a7bab12bb62/who_invented_homework.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/gary_vaynerchuk_content_model.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/jibisebukosapigovif.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/cif_cream_cleaner_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/jenigu.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/oracle_sql_tutorial_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559ef88a-88e0-4932-a371-58bed038914b/sri_lakshmi_ganapathi_stotram_in_telugu.pdfIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_7651431c59fb4c0c9deb7b70509fa8bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d993386-f9c5-4bc7-9e90-b533155fd61e/letra_del_toque_de_bandera_mexicano_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/murejiki.pdfIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_346b01796d7c4fd98d4e924f831b3bab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/950cdeac-1fdd-4c83-b144-484a38461522/tosozofusapafazugadanawi.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_17359ef299bf4255ad63b9f4cf03de3b.pdf?index=trueIn 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_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 5040 bytes
SHA-256: 425a5f93e770b6c0216db1e960097ed3df26dabe6260ca8c9727993ec3dade50
font_01_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 10772 bytes
SHA-256: 8761d91140c74826c8201dcefa7eb845e416dc7d0a15b8ce7b3d12a87636f7c5