Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c26f234b2d2940…

MALICIOUS

PDF

84.6 KB Created: 2021-05-16 02:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ad1afb7869a25b1ec2ed6eed2eb2ddcc SHA-1: 9e2dddf2319539159d7409ddcb1c8a0e526acdaa SHA-256: b2c26f234b2d29401530f43322f2ac9e7f15c0aec8e79985e117191cfcde714f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URIs, 'https://gimoguvi.ru/strik?utm_term=how+to+set+a+resmed+airsense+10', indicates a potential phishing lure related to medical equipment. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/strik?utm_term=how+to+set+a+resmed+airsense+10 PDF link annotation
    • https://cdn.sqhk.co/wosipuvetot/Qhihhl8/masha_and_the_bear_birthday_theme_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/hbgciaq/74471762646.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/7ZcbFlQ/gobaxapanipobusinuj.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/nutimasazufebej-tijarotosot-tigetuzid-zafadubev.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/7294030.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/44jjlPM/application_flower_care.pdfIn PDF document text
    • https://cdn.sqhk.co/zisazege/hehgMge/xebapilevigi.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/gPShd6k/numaniwu.pdfIn PDF document text
    • https://saritubix.weebly.com/uploads/1/3/4/5/134507132/xunozomo.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/nunijipu.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/ijieahb/3276552197.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/heicL5x/gba_emu_ios_13.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/da3Viee/plain_city_animal_hospital.pdfIn PDF document text
    • https://ludunijup.weebly.com/uploads/1/3/0/9/130968942/lemesenipi.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/ghfhb8S/word_search_puzzles_printable.pdfIn PDF document text
    • https://dexisuliraj.weebly.com/uploads/1/3/5/3/135346252/sexuvubumapufo.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/5748e5e3-cac7-4248-a83d-99ec8d564638/2007_harley_davidson_softail_custom_service_manual.pdfIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/comptia_cysa_practice_tests_exam_cs0_001.pdfIn PDF document text
    • http://bajupigirosinaf.atwebpages.com/julizigejugugubizakizig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feabff76-b727-43c7-851e-8b67626df884/what_is_the_goal_of_sentencing_criminals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58b6671-455f-44f7-a60b-90f2a91f5861/honda_gcv190_pressure_washer.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 5188 bytes
SHA-256: 116c976eb8f99fc0f910ddb6b97e3ca62a5dc9a11a61f47c9bb968e8563c5183
font_01_sfnt_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 11508 bytes
SHA-256: d2eac6e85499a0265debe5f01eadbccf7b7ef6d019ed664b9b1b14017bbf7c3f
font_02_sfnt_off00012fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB2 16136 bytes
SHA-256: e062faff0b5f3d12ef96d17a813e209689a07cec8984531399442ab350abe39b

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