Malicious PDF — malware analysis report

Static analysis result for SHA-256 8542fc49f70a9182…

MALICIOUS

PDF

84.8 KB Created: 2021-06-10 16:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a6a4e41545ad565c374e4a26c7d2119 SHA-1: 74a78821f5d35b20f497fe7ba561e73ae0745185 SHA-256: 8542fc49f70a91828bc0be0616d9151efccf0e1d9a78dc9a0b41826ff0b50167
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of 'bubble fruit mod apk' in the document body and a linked URL indicates a lure for potentially unwanted or malicious software. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/pbw?utm_term=bubble+fruit+mod+apk
    • https://fogovuraperikog.weebly.com/uploads/1/3/4/7/134713912/tokexomobosire.pdf
    • https://vimiwakemimug.weebly.com/uploads/1/3/1/6/131606159/3486333.pdf
    • https://filajusarapobu.weebly.com/uploads/1/3/4/7/134761194/bimexutipujubuk-gexaw.pdf
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/kosugakisus-gupememuwimif-dugopoxaxivag.pdf
    • https://dametubidino.weebly.com/uploads/1/3/1/3/131383661/nirekaxibavajol-bijobadufel.pdf
    • https://bafewalu.weebly.com/uploads/1/3/5/3/135350628/c213cd13e6.pdf
    • https://kotemuzever.weebly.com/uploads/1/3/4/8/134884044/7622854.pdf
    • https://lutividagij.weebly.com/uploads/1/3/4/8/134896544/natefig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/10c1661e-9fe5-44e4-a8b6-7423ad97af7b/8207137322.pdf
    • http://wasazejis.pbworks.com/f/dulumugudinexavinewojofad.pdf
    • http://pejokawigar.pbworks.com/f/engineering_mechanics_statics_13th_edition_download_free.pdf
    • https://uploads.strikinglycdn.com/files/7158940c-4697-4686-9712-2e7b3d2002aa/what_are_some_cool_last_names_for_a_girl.pdf
    • https://uploads.strikinglycdn.com/files/bd7b41c0-300a-450d-9df9-6abdf15601a2/alfreds_basic_piano_library_lesson_book_bk_1a.pdf
    • http://gufabewa.pbworks.com/w/file/fetch/144674484/lofaregusatuwixud.pdf
    • http://viluxese.pbworks.com/f/lutekavalogalafapudi.pdf
    • https://uploads.strikinglycdn.com/files/07fce4e6-7a84-49be-a0be-052fec783acf/shimano_ultegra_di2_10_speed_rear_derailleur_long_cage.pdf
    • http://kigofot.pbworks.com/f/bujoridanabi.pdf
    • http://fokojifidesi.pbworks.com/f/what_legislation_do_teachers_need_to_follow.pdf
    • http://redelaw.pbworks.com/w/file/fetch/144535869/72914738298.pdf
    • http://mavujeridolu.pbworks.com/w/file/fetch/145057485/sexuxekafanofu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012686.bin
692603af8c442e268debcf10e4df2c5a5c278cf01ec01737ae2fd593ba123746
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12686 18700 bytes
font_00_sfnt_off0000e246.bin
4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 2960 bytes
font_01_sfnt_off0000ecc7.bin
deb122e1895c6b1394597a2de57ba51c4244b44a4287b830562b89c1a8e2867d
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 5260 bytes
font_02_sfnt_off0000fe93.bin
5a07ea71499181ffd3ee800ce9d7df5089cb6bd4b07e133418cd9bde8869a1c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 12148 bytes