Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecec310f65c762ce…

MALICIOUS

PDF

71.5 KB Created: 2021-03-22 11:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2d88ad817b634e8a6a5539f4004b2ec6 SHA-1: 6194ee4f6cc1c4ea7afaa246b133b32453c31cae SHA-256: ecec310f65c762ce093a277d945066bb794b6a0bb8b2980723777cf041e46a79
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL `https://jumiwimov.ru/wix?keyword=introduction+to+sequences+worksheet` is likely used to redirect the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=introduction+to+sequences+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493227/normal_6032909622dcf.pdfIn PDF document text
    • http://pristav.pro/what_does_the_number_806_mean_in_the_biblevwn1z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_5fd882a895b89.pdfIn PDF document text
    • https://debesawoxud.weebly.com/uploads/1/3/0/7/130775383/bivuxa.pdfIn PDF document text
    • https://tinuxitimo.weebly.com/uploads/1/3/4/7/134748051/jeliragijo.pdfIn PDF document text
    • http://smartbright.club/a_little_history_of_philosophyrjran.pdfIn PDF document text
    • http://remastacer.com/pakistan_army_wallpaper_for_mobile_hd4ae55.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/8633357.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/10d68e0e-cfec-4423-bc8d-958b2219ad11/sony_hxr-nx100_full_hd_nxcam_camcorder_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86912c64-52a4-4c37-ad18-aa7a0a68cd09/the_secret_life_of_bees_audiobook_chapter_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad46eba-5dbf-4d16-8a77-31716f836bf9/59035135460.pdfIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_5b9c910d58ac41ef963d4a7dd3ef298a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48ad2b9-5826-47c2-b3b5-82e0ceab497c/22704572727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d8866b-d29a-4784-a082-9cc84a16fdbb/87150305564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e000d2f-66da-4a0c-bac2-261b1555c0c4/lasiparubonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb9791d-8335-47ed-9c61-545b58d412ac/spanish_english_legal_dictionary_free_online.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_1c4e9bec83d0469687c2f9b721ac1737.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_9bce0fbe64e84828b50918813fae6305.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_36a49b299c744c17aff2da9f48a64e6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f3f03d-6cc0-4b2a-8d42-a93f7c47b27c/nuwidojumaputusik.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_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 5004 bytes
SHA-256: 304061296d10ee474245dd8010f80ed829c6fb820b3f52fcee156f3d7a5dce5e
font_01_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 10216 bytes
SHA-256: 94cbaa8462404850f338b19d04ffbd691d25b926d584530ab9162afe6761757b