Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4fd05eb6e287fd…

MALICIOUS

PDF

82.2 KB Created: 2021-04-01 21:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 71e8ae890fa1f564b7339805d905e572 SHA-1: 9319d27298a02ac90d9693bb3fc691bdbb5ed81e SHA-256: 0e4fd05eb6e287fdabe5c0e85d395f5a2fc295684153cc0e7f8c916cb8722db3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, https://baarspo.ru/123?utm_term=causes+of+the+great+depression+worksheet+pdf, is presented in a context that mimics a worksheet, likely to deceive users into clicking through to potentially malicious or ad-heavy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=causes+of+the+great+depression+worksheet+pdf PDF link annotation
    • http://bewakidigi.22web.org/kitebaliwazoboxe.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/agectjd/nhl_schedule_release.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ididKij/89676005593.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456121/normal_6007991cba73b.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/uGKhhbZ/stunt_bike_freestyle_mod_apk_new_version.pdfIn PDF document text
    • https://cdn.sqhk.co/xixofivib/5jijMIe/camera_for_laptop_price_in_pakistan.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/Zigcgjf/merge_magic_cheats_challenge_16.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/wAigYnO/download_underground_crew_2_drag_racing_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_6038d4225b272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_60581bc90d60e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481985/normal_6002028cf37a4.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ifujdiG/mega_bloks_racing_rig.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
    • http://lejapanuvijul.rf.gd/pilituzonoden.pdfIn PDF document text
    • http://dadivudibe.epizy.com/fortnite_storm_racers_challenge_guide.pdfIn PDF document text
    • http://pukugatiwuz.epizy.com/computer_service_price_in_india.pdfIn PDF document text
    • http://kukalofawofami.epizy.com/pagomawo.pdfIn PDF document text
    • http://retukazitoja.epizy.com/how_to_reset_my_voicemail_password_metro_pcs.pdfIn PDF document text
    • http://novotufimaxanu.epizy.com/zolipewas.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_d2314c8b09db43368c625c616cc07768.pdf?index=trueIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_012076429f41468ea72ff69d4a1614fe.pdf?index=trueIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_4dc5a56241534c9197022b0f81df4308.pdf?index=trueIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_d6e8a4cc391248588a43d1fa8e0dc55f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 5332 bytes
SHA-256: 31385efad8fadd6daec6373ccd8c3b3ee7069831f4fe16c0bb085dea721c012d
font_01_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 10648 bytes
SHA-256: 52a071f1fd5f43fc78052f7dd1080caf7d79cbc77c8a1f1327342aa89985ddc5
font_02_sfnt_off00012c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361