Malicious PDF — malware analysis report

Static analysis result for SHA-256 20742c2dd17c870b…

MALICIOUS

PDF

81.5 KB Created: 2021-01-12 11:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 39af0d8a1d96281fdf99ec97f19a13a9 SHA-1: af0c2e12057055471ec21e85e205baad54822ec3 SHA-256: 20742c2dd17c870bb5680d124b0b8dd79c5aee0bab96425e663d3fb7a841cb74
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious, containing numerous embedded links that point to external PDF files hosted on various domains, many of which appear to be disposable. The presence of a link to known malicious redirector infrastructure and the sheer volume of outbound links suggest a campaign aimed at either distributing malware or engaging in phishing activities. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://gettraff.ru/123?utm_term=rights+management+adhoc+office+365 In PDF document text
    • https://jitivafume.weebly.com/uploads/1/3/0/9/130969372/7225536.pdfIn PDF document text
    • https://bejutenexej.weebly.com/uploads/1/3/3/9/133997629/madikeka_zepimidusazu_laderebix_bakofag.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/1407642.pdfIn PDF document text
    • https://majemuxisirilud.weebly.com/uploads/1/3/4/7/134719568/tuvak.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/kigebusa-notuvituna-nosim-dijeviso.pdfIn PDF document text
    • https://roxejane.weebly.com/uploads/1/3/4/4/134486752/soteperolojisub.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/154714230facb3a.pdfIn PDF document text
    • https://site-1180773.mozfiles.com/files/1180773/modern_wardrobe_furniture_designs.pdfIn PDF document text
    • https://site-1168117.mozfiles.com/files/1168117/best_baby_skin_products_for_newborns.pdfIn PDF document text
    • http://www.opentle.orgIn 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
    • https://s3.amazonaws.com/lupuvogotog/organic_chemistry_a_guided_inquiry_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/terotekonezavew.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/geebung_weather_report.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000dbfa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDBFA 14808 bytes
SHA-256: bd4c0cb8f5c71afa21de82377e5f1f9e9bd7c74bf5e278c9a83530d0c668169c
font_00_sfnt_off0000c948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC948 5544 bytes
SHA-256: bfa9519b592253081579e6aff41626cd22f336939a1c6e4295a495a3d2bdde00
font_02_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 10924 bytes
SHA-256: f186b794905116d63fdce0039447f512329c346b6fef0b127adbaf8340a0e720
font_03_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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