Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c1a63a390b4d55…

MALICIOUS

PDF

89.7 KB Created: 2021-03-29 23:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ce53f2b77c7a1ee12d39efbbf0c6165d SHA-1: ef7be8188525f0e228131f202b13b5ec865d37a0 SHA-256: 80c1a63a390b4d55eaa04b40ef8c8742140fc89b2486256ab7675ea976aca9a0
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

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.
  • 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://jumiwimov.ru/strik?utm_term=7.3+conservation+of+energy+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5fe3c90a87985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459467/normal_5fe115e594d50.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/MiijZiH/live_video_call_random_app.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/F1xhg1g/tips_for_buying_and_selling_sports_cards.pdfIn PDF document text
    • https://cdn.sqhk.co/wedowetaso/ghgdK7u/mefapewenubitigajerafoto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489599/normal_5fc9a33036990.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/igAtwOT/72880573054.pdfIn PDF document text
    • https://cdn.sqhk.co/muvifisi/fjie6ji/92425131420.pdfIn PDF document text
    • https://cdn.sqhk.co/vizefejij/ighj6jb/93050583469.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501212/normal_60021fb2390de.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/jcgexwz/money_maker_3d_print_cash_download.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/32a05918-fc46-4f4b-bcad-5fe352f3cb0e/minn_kota_owners_manual.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_249391111bee422897e579d8e05726df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4579e0c3-ba2a-4e52-a843-722a7279a986/10704730234.pdfIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_08543df1c89547ab996313136de49b9e.pdf?index=trueIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_394a586378a94555b826d09048e5d207.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_d39f1bf9ec6c45d195e97051c486db48.pdf?index=trueIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_d59c0ab95fe3496f889e9d1ddea5acdf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5b1c88-bc6c-4ec3-a2c5-1d10e840e938/pulgadas_a_milimetros_en_fontaneria.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 5304 bytes
SHA-256: 4eb2c6c22a9d203954578fc433277fae215268ec8d0880ffa2a0f19b2eed662f
font_01_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 10720 bytes
SHA-256: 9a19e2fde98855f5155e68522abd15fc903e4fd9262e58b0d1a1bf6c861e708d
font_02_sfnt_off00014ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2