Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f9838e20bb72b6…

MALICIOUS

PDF

83.9 KB Created: 2021-04-05 03:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8b5cbf919b3048fc985ecf5194ae34ae SHA-1: 1355b69f54228ec4293d98805f57b449e05470ba SHA-256: 81f9838e20bb72b6c6dad3148c82f59300cd6b112288b85c6122a29d41c825c4
186 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to distribute phishing or malware payloads. The presence of external URIs and a link farm points towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/aws?utm_term=sinners+in+the+hands+of+an+angry+god+summary+pdf PDF link annotation
    • http://raicen.com/java_emulator_for_android_2._3_free0dawi.pdfIn PDF document text
    • https://voxukosobezut.weebly.com/uploads/1/3/4/8/134846839/fawesiz_losozesosix.pdfIn PDF document text
    • http://italysummer.fun/rolimozaliditumadopozibaur8v.pdfIn PDF document text
    • https://gibitomenufe.weebly.com/uploads/1/3/4/0/134041720/778c6a80b9e2306.pdfIn PDF document text
    • http://itdiscount.info/kotudaxedodarujikkv8h.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/3087084.pdfIn PDF document text
    • http://7lessons.space/81619054127p55pe.pdfIn PDF document text
    • http://creditscorefix.info/89494515829ea0py.pdfIn PDF document text
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/derolinezekikog.pdfIn PDF document text
    • http://whysmall.space/what_are_some_examples_of_fairy_talescete1.pdfIn PDF document text
    • https://rikusinifo.weebly.com/uploads/1/3/4/0/134017093/d03a1ffc20b2.pdfIn PDF document text
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/1501467.pdfIn PDF document text
    • https://fakavenudir.weebly.com/uploads/1/3/4/0/134042443/946955b.pdfIn PDF document text
    • https://jifefovemerozix.weebly.com/uploads/1/3/4/4/134444698/7044319.pdfIn PDF document text
    • https://jitugitux.weebly.com/uploads/1/3/0/7/130740190/toxuse.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/gilorum-kumuwaku-gerusutetedu-gimetobakisi.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/xabukojizew.pdfIn PDF document text
    • http://meetcabinets.xyz/how_to_clean_leveluk_jr_2rfpss.pdfIn PDF document text
    • http://ita-women.space/evca_reporting_guidelinesedulw.pdfIn PDF document text
    • https://kijaxupujik.weebly.com/uploads/1/3/2/6/132695195/2696504.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/644515a.pdfIn PDF document text
    • http://ketousa.site/adso_in_bw4hanatww6u.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/1405015.pdfIn PDF document text
    • http://baffer-shop.space/nelson_textbook_of_pediatrics_21st_edition_price8rzt2.pdfIn PDF document text
    • https://pusuxefemaj.weebly.com/uploads/1/3/4/1/134108889/warukera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 5628 bytes
SHA-256: 3ba1b9176db47678527fab525dbdbd0754732b475d55ffd3078f5132cab23995
font_01_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 11832 bytes
SHA-256: 59834b8eaf1732a22cd17ccb5001d6872d53da5f46ff362e1d0abd532a6b5fe0