Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79b0f54ae85fb78…

MALICIOUS

PDF

94.1 KB Created: 2021-02-21 20:20:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 867e22ff47b89a9ba3f8822962fa1028 SHA-1: 9edec1f6035dcf7a4730ea4a7ec2cf1ba150c53b SHA-256: f79b0f54ae85fb784bc319e26fcab1a8ec439d131a45c26ada58d435f8e1b3e1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or link farms, indicating a malicious SEO or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://bologen.ru/wix?keyword=saeco+incanto+deluxe+manual PDF link annotation
    • http://bcpzonasegurape2-viabcp.com/anydesk_free_windows_7g4xcc.pdfIn PDF document text
    • https://romagazep.weebly.com/uploads/1/3/4/7/134759296/tosawalotekad.pdfIn PDF document text
    • http://shoppingyxplus.xyz/1401257831917eek.pdfIn PDF document text
    • http://bufo.online/kubojefoxosibitafulmzgiq.pdfIn PDF document text
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/fomevaranubazi-jakuxowuwodora-popifujobe.pdfIn PDF document text
    • https://jomufoxubibad.weebly.com/uploads/1/3/1/1/131164047/9485211.pdfIn PDF document text
    • https://pumewigegokofav.weebly.com/uploads/1/3/4/3/134317234/83d8eef4c02.pdfIn PDF document text
    • http://venira.su/rujotitezeryfjv5.pdfIn PDF document text
    • https://togezajotutev.weebly.com/uploads/1/3/0/8/130874352/batatoxu-tuwilerid-nejaviw.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/vapazadoxibimulo.pdfIn PDF document text
    • https://nixogizuriv.weebly.com/uploads/1/3/0/7/130740196/931123556b22d38.pdfIn PDF document text
    • https://dijekoko.weebly.com/uploads/1/3/5/3/135315120/6bf05a6f16d6152.pdfIn PDF document text
    • http://tisigetid.iblogger.org/days_and_months_in_spanish.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://pamixawikisif.epizy.com/wopuletonatiwowusu.pdfIn PDF document text
    • http://pewazeje.rf.gd/british_and_american_english_spelling_differences.pdfIn PDF document text
    • http://gobavaduxa.epizy.com/50688312813.pdfIn PDF document text
    • http://forozilixoder.rf.gd/fifawamotakeke.pdfIn PDF document text
    • http://puwagof.rf.gd/lobuseronegiguxadabagaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 4864 bytes
SHA-256: e4bc230f25ce3d1613f6913271dfbb7ccb1c806c79717c987aa67d0307de44f0
font_01_sfnt_off00012474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 10244 bytes
SHA-256: ae9ecb6130efa1e7c42fb945d33fae293bcec14c0462e988e27a400a8950025c
font_02_sfnt_off00014782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14782 16120 bytes
SHA-256: bd9e9214c721b7c9de5c072df30e9f3e7e2f7bc5e8553367b449161fc10d2c14
font_03_sfnt_off00015c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f