Malicious PDF — malware analysis report

Static analysis result for SHA-256 b496a50b8d614349…

MALICIOUS

PDF

77.3 KB Created: 2021-02-23 03:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cbd939a519a00f1a44158ec43e6bd3c5 SHA-1: f4128626d40160b14645ce8997cd41a182278544 SHA-256: b496a50b8d6143492da2d5dd6aa6ce303be96e577b44069c244fe6357179ee22
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution lure. It contains a large number of embedded links, including one pointing to a known malicious redirector, and others hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The document body is heavily obfuscated and appears to contain junk data rather than user-readable content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=kohler+command+cv15s+oil+filter In PDF document text
    • https://lezezirurebox.weebly.com/uploads/1/3/5/9/135967023/xudofemimedowobokar.pdfIn PDF document text
    • https://kuxaxamolexude.weebly.com/uploads/1/3/4/8/134869233/nuvixizurafiwevere.pdfIn PDF document text
    • https://leneguvajetuse.weebly.com/uploads/1/3/1/3/131380977/1351474.pdfIn PDF document text
    • https://fapudajom.weebly.com/uploads/1/3/2/6/132681453/pegujabazagozu_kesuviparaxuter_rulodokazurite.pdfIn PDF document text
    • https://fetubuka.weebly.com/uploads/1/3/1/3/131379928/9397003.pdfIn PDF document text
    • https://woxopipuwesubaj.weebly.com/uploads/1/3/1/4/131453061/4501c.pdfIn PDF document text
    • http://gazorowegesejix.22web.org/gaselozurisudalemuru.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/vozekomafaf.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/neresidizopofa-mudubemileti-nifanata-lodusurid.pdfIn PDF document text
    • http://nimuvefote.iblogger.org/pride_and_prejudice_summary_chapter_29.pdfIn PDF document text
    • https://dukazegisow.weebly.com/uploads/1/3/0/7/130740117/nekokuxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jitapalerex.rf.gd/wonenodopi.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/kupir.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/38876115604.pdfIn PDF document text
    • http://zadiken.rf.gd/51432605096.pdfIn PDF document text
    • http://jefevuxivux.epizy.com/guzuzo.pdfIn PDF document text
    • http://relumewamamit.rf.gd/84068085507.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/how_to_draw_faces_anime.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/aashiqui_2_movie_hd_tamilrockers.pdfIn PDF document text
    • http://suzefomon.rf.gd/pivuwilodug.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 5256 bytes
SHA-256: c358fbd018b9252b1f4018b1df2cd31a1faf11f371687236087de4e2a3b3ae16
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 10340 bytes
SHA-256: ffa8d6e530f1f5e158a606168904f88c9cbd587b5ce3ee4d92c658ead9180e78
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333