Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bac80a70c470f9…

MALICIOUS

PDF

79.7 KB Created: 2021-02-22 00:48:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb4b0f2978bc91eee1486ce40ab4bb90 SHA-1: db9ada11f77e1e001ad30ce36eed6daa0941e3d6 SHA-256: 61bac80a70c470f98f35cdc456f54d3d5d7279db0a080d465bdaebb675438a31
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple critical heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary URL identified is 'https://crophysi.ru/wb?keyword=how%20to%20setup%20my%20linksys%20ac1200%20router', which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=how%20to%20setup%20my%20linksys%20ac1200%20router In PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5fcf06016e8d0.pdfIn PDF document text
    • https://xegoratan.weebly.com/uploads/1/3/2/7/132712572/2067715.pdfIn PDF document text
    • https://fulopovesaj.weebly.com/uploads/1/3/0/7/130740112/7eccc3acb203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_600c21bd9f2b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_60158c176227c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_6013991800a65.pdfIn PDF document text
    • https://xafovudomogagak.weebly.com/uploads/1/3/5/3/135324285/jexerupeti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408482/normal_602b73fce3f4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fed66ee5c996.pdfIn PDF document text
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/jogavanizod-marufufenodabib-zuleborisurux-fuweliliw.pdfIn PDF document text
    • https://reluxepeguru.weebly.com/uploads/1/3/4/3/134363030/8705232.pdfIn PDF document text
    • https://vejupurujiku.weebly.com/uploads/1/3/1/6/131606174/4678661.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/rowadaxuvadawu.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/76239519189.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 5624 bytes
SHA-256: ff8dfa8b1a12a88546d4daa9dcf17d3babf9733b39442a9edb2e7c4ae74851d8
font_01_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 10448 bytes
SHA-256: b144ea217ea78b920c68b60855a69828b9076fcde851f633b144ab22bec88710

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