Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a3a62e9aa3aace…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 00:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8e0d103e1efd717c5f4aab23cba34cd SHA-1: 96862168379b86a4932455303cec96fb4149db83 SHA-256: 15a3a62e9aa3aace3163bc878b67b522cbcd4f0920d72fd737da6deed577f8af
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document, likely delivered as a spearphishing attachment, designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

Heuristics 6

  • 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.
  • 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://fokemale.ru/award?keyword=adverbial+clause+of+time+exercises+pdf
    • https://cdn.sqhk.co/poxirowo/giuicql/walking_dead_no_man_s_land_cheats_2018.pdf
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5fd060834c5d0.pdf
    • http://wepalulinoviwo.iblogger.org/wimipigulunu.pdf
    • https://cdn.sqhk.co/jupozaregu/UhehjCa/electronic_dance_music_festival_meaning.pdf
    • http://somamorizeti.iblogger.org/lujiwivimo.pdf
    • https://cdn-cms.f-static.net/uploads/4426813/normal_601d68e2631c7.pdf
    • https://cdn.sqhk.co/disumuneriva/bDhiJm3/54112240670.pdf
    • https://cdn.sqhk.co/zukasedu/Shcgegh/business_strategy_examples.pdf
    • https://cdn-cms.f-static.net/uploads/4366965/normal_6032dcf718d1b.pdf
    • https://cdn-cms.f-static.net/uploads/4499979/normal_5fdbc6131b9f2.pdf
    • https://cdn.sqhk.co/femogefuv/Rrjb8gd/into_the_badlands_champions_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_627c4ff726314db189356b226c1695dd.pdf?index=true
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_f67afad95c704849aee9f9cef95b8ecd.pdf?index=true
    • http://falalovoxiwada.epizy.com/gojop.pdf
    • http://bezopiwuzalobit.rf.gd/palayathu_amman_remix_songs.pdf
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_0f59043a0be946e5ac72280a472b877a.pdf?index=true
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_4bd14b170e3d41dd9fd35af073916c95.pdf?index=true
    • https://uploads.strikinglycdn.com/files/31828afa-55e2-4bc4-af97-e6cf776cac1b/how_to_change_garage_code_keypad_clicker.pdf
    • https://uploads.strikinglycdn.com/files/b4601737-e190-4056-8672-912aba7b6154/16264961405.pdf
    • http://losuguv.epizy.com/nugeriwadonijinipi.pdf
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_6047d79aae614711a79a9c6be5fd8f1b.pdf?index=true
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_c3628a6094ab42d086ba4ed230562466.pdf?index=true
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_611952ee8af8464e815945b8b22376ec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f6ff14d1-97c2-4341-af37-ad7aa5757817/34938899927.pdf
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_adc739355ef24bc4a0dc149b892c1e26.pdf?index=true
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_2010944708c749b6b74c1a007299833d.pdf?index=true
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_2c5d8c0ba46b437aacb27b2575f0801c.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f324.bin
6fe3bdb5d1f858144f4b7a55f009f7bf5ee942ce2e67d94d9ffed112e3632c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 5560 bytes
font_01_sfnt_off000105fa.bin
ceff16f758690b800c7bead6775ddc608a5722c03ed242cb727f852a0c39760e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 11540 bytes

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