Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90d46891af59c51…

MALICIOUS

PDF

71.9 KB Created: 2021-03-29 15:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 60dc86e7136e85304b1a7dfe5bbd4965 SHA-1: a5aac814fdd8079e593433de998a5a3d5bbcfb15 SHA-256: f90d46891af59c519ce2e4d5cf6638eff993250198de630c4fbb045ec27a7227
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('maypoin.ru') that is part of a link farm, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://maypoin.ru/wix?keyword=ernie%2527s+crab+house+greenbelt+maryland PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459180/normal_5ff856ea73a0a.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/3340398070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_603f886d5a3b8.pdfIn PDF document text
    • http://mevobul.22web.org/stayin_alive_tab.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/bojuluwepijor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_605c9ada84b0d.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/parejas_homosexuales.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/ff2f267e-e1c7-4a28-bf4b-a434b5bf97ef/zapuwazujitezovinefebazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c7c9dc-aa8d-4ee1-94a0-3e777fcff82d/9145370798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7744109e-7749-449a-9a66-8484ae1c3532/fukirujuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae502f72-47df-4e06-8b95-c16d7b142497/freightliner_cascadia_fm_radio_antenna_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bd47c1-8d2b-43c0-baf7-2c03ed4b1156/nowugagubimumigusoxifur.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/53409072879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60310ca0-b6ef-48a0-b3cb-31a77ce0cfa0/fofitik.pdfIn PDF document text
    • http://wezegene.rf.gd/82768376838.pdfIn PDF document text
    • http://gitexilamivori.epizy.com/catechesi_tradendae.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/how_to_administer_g_tube_meds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a70d445-d044-436e-b4b7-7176bce37282/243254931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e92ed5-0e01-4ea4-a01d-a09020c9c159/kwikset_powerbolt_2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601d7ec5-dea8-4922-884f-27a452527625/how_to_fill_bobbin_in_singer_sewing_machine.pdfIn PDF document text
    • http://zaxuzut.atwebpages.com/apple_mac_user_manual.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_off0000cfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 5588 bytes
SHA-256: 04b866a7012871d5fea4888f41ce3cb5cc81ea13b01072b6a0fef6e95d44e4be
font_01_sfnt_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 2172 bytes
SHA-256: 9738ceee40076f8646ac9230d8d0306d5021bd70633abedf95ee04e2eafce790
font_02_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 11040 bytes
SHA-256: d55cf46be92331a17fd19784f4a907e2609e94b803e49e2fab4e406a18e51aff