Malicious PDF — malware analysis report

Static analysis result for SHA-256 31678af3bfa77283…

MALICIOUS

PDF

81.3 KB Created: 2021-03-22 01:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81ddedb7fd2685aa65f98c7575cc325c SHA-1: 2ffb5bb58c1d0769a380f21fcf3b1beced079b39 SHA-256: 31678af3bfa7728381134d6fc086cac42d3c87ed4037c65e8138f150e57de7d3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links intended to manipulate search engine results or direct users to malicious sites. One such link, 'https://bologen.ru/wix?keyword=johnny+appleseed+legend+pdf', is directly embedded. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=johnny+appleseed+legend+pdf
    • http://citimart.online/display_excel_worksheet_full_screendpzzg.pdf
    • http://reduslim-italy.site/86006561343m3by1.pdf
    • http://argo-tourism.com/elements_of_statistical_learning_hastieati6j.pdf
    • http://cybety.xyz/goxezag1sgoo.pdf
    • https://kudarori.weebly.com/uploads/1/3/5/9/135960502/1633976.pdf
    • http://pixell.store/boeing_3_letter_airline_codeshk7in.pdf
    • http://activa-fb.com/how_to_change_in_paintki0eg.pdf
    • http://kostlike.site/minuturalqm8zm.pdf
    • http://daimontimur.org/kezodonuzuxobewir459w.pdf
    • https://limifotediko.weebly.com/uploads/1/3/5/3/135325738/810e98d5fbdc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_df8a9c12b6a3442e8493fc9b9e3fd31d.pdf?index=true
    • https://s3.amazonaws.com/nawuvud/burner_app_android.pdf
    • https://s3.amazonaws.com/likadojivivofu/bluetooth_mic_for_video_recording_android.pdf
    • https://s3.amazonaws.com/ropuba/are_electric_blankets_any_good.pdf
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_beffbb8a588149309f402baa24ac4079.pdf?index=true
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_b2b124986e7c40279497e9be2367c10b.pdf?index=true
    • https://s3.amazonaws.com/kovozenamofox/91735316635.pdf
    • https://s3.amazonaws.com/nilafafakem/stihl_chainsaw_038_manual.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdcd.bin
f85df96d501846daaf5b212c46c9ed067e758d247a48a56e111ab5ae3e68bb8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 5296 bytes
font_01_sfnt_off00010fdf.bin
e8470b1d3e7549b7b401f06c7a337bce3c697111fb138902afb2ddffb7f618a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 11848 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.