Malicious PDF — malware analysis report

Static analysis result for SHA-256 701002b95a1277d8…

MALICIOUS

PDF

83.1 KB Created: 2021-05-24 17:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2b7f8bd14f3df2c85e7284e4d2196473 SHA-1: 3ee2c53dd7ea8515750bc7361805a46f6183b58b SHA-256: 701002b95a1277d8303b965565178993450dc443559769f04463c2ffc34bba2f
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary lure appears to be a fake search result for installing Microsoft Store on Windows 7, aiming to drive traffic to these malicious or spammy sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=how+do+i+install+microsoft+store+on+windows+7 PDF link annotation
    • https://jatilupek.weebly.com/uploads/1/3/4/4/134491857/8269918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492900/normal_60045d40795af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381102/normal_6037115184e73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_5fd72cb0d5253.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/c1045722899.pdfIn PDF document text
    • https://tizidebiwefixim.weebly.com/uploads/1/3/0/7/130739379/a22cc4575a1c069.pdfIn PDF document text
    • https://werunumugupis.weebly.com/uploads/1/3/4/3/134399568/37891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446165/normal_60610a741388f.pdfIn PDF document text
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/zopotom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_6029a2c177fd4.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/4fd018df-5aef-4961-baad-2628bb26f3bd/washington_dc_hotel_deals_near_national_mall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d67de6c5-9df9-48dd-a160-78eb8f7d320f/fupakirag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5eb0a7d-3b5b-406d-9c9c-a14f0e0a5a9b/wositexatesitinodim.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/95720912841.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/kararipizuwiwitumijupadu.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/current_political_leaders_of_india_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/31826836365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ac6836-d805-47a4-93ba-eadb32a97312/john_deere_7000_planter_manual_online.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/75504058245.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/lenovo_t420_bios_update_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/wodila.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/what_navy_awards_are_worth_points.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/lane_recliner_repair_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598a6448-d7e9-4393-ba7a-b92572f57c3d/65740440521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd8f4f5-920c-46e9-9696-f623b0eaff7e/42824353397.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_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 5300 bytes
SHA-256: c651327c5822528e970b04d588ce223b15aea617761c9542a762549a111bc664
font_01_sfnt_off0001179d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 10912 bytes
SHA-256: a4b37f587fbf34c39331e569ed47527039d1737920f6782ad50b8cc9d1b1450c