Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86dd385d532ebd1…

MALICIOUS

PDF

82.4 KB Created: 2021-03-22 18:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f782e09b96da68a202441d7d45fbc9c8 SHA-1: 0358543b0e6f807034a800e6453753e424924d3a SHA-256: b86dd385d532ebd1520be0b8a7760731931cab43174a2f838e774b538a5a2b26
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous external URLs, including one pointing to a potentially malicious domain (ponafet.ru), indicates an attempt to redirect the user to external resources, possibly for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://ponafet.ru/strik?utm_term=vampire+diaries+cast+season+5+episode+9 PDF link annotation
    • http://br1.red/petit_prince_rose_renardvu0fo.pdfIn PDF document text
    • https://pizavanaxuvilu.weebly.com/uploads/1/3/5/3/135386491/10ba312e.pdfIn PDF document text
    • http://test123test.xyz/which_fictional_characters_am_i1eln2.pdfIn PDF document text
    • http://wejewirivi.iblogger.org/81500815082.pdfIn PDF document text
    • http://markettop.pro/cuisinart_ice-30bcp1_ice_cream_maker_2-qt_silver_manualpsjf1.pdfIn PDF document text
    • http://spainwow.pro/vudulotabenuguxunu4wbvs.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/79c33b5.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/dudaposewiti.pdfIn PDF document text
    • http://boomerangoo.site/bedarakevumemelexepkcvng.pdfIn PDF document text
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/1110884.pdfIn PDF document text
    • https://raxiruzaxulam.weebly.com/uploads/1/3/0/7/130738564/puvexekojotefes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suxiweke/how_to_use_battery_calibration_pro_apk.pdfIn PDF document text
    • http://faduzidivatakid.epizy.com/gunexozekes.pdfIn PDF document text
    • http://vadawowugozopul.epizy.com/35996137575.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/wasamabidinowudabuti.pdfIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_4442ea38b98a4a3e91bcda4dde109c5f.pdf?index=trueIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_10e30ae6f6d54dad8202d4d0d00b55c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mizeteb/33241962641.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_77ba94c7d33643d98ae4343f781b6344.pdf?index=trueIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_25972613e3d545ec8ecf4ad477aeedad.pdf?index=trueIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_d373ba2c3ee148cba1a4ecb880ad6b1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mavixu/buriwikuziverar.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_eb9b4ffc3b9c4c0d92ce4159d797780a.pdf?index=trueIn PDF document text
    • http://bozivexaterem.epizy.com/behen_hogi_teri_movie_song_likewap.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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 5432 bytes
SHA-256: a3eb4f48485a80259b37ca49fd57ceef2fa2e557539ce911a026cedae4cb33bd
font_01_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 10856 bytes
SHA-256: 540e66982d55846f44605747687e968b83a556b5a114214e24744eaabc5e8511
font_02_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 16632 bytes
SHA-256: c50702d4acfbab276db04c5221898060464ebd298806f96ba401251afed68d5e