Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99ddca6d60301f4…

MALICIOUS

PDF

75.7 KB Created: 2021-01-21 09:06:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ecc86d040036265001d11cfe535f4067 SHA-1: 5635740542af172820f8004324aa2d99b5b9b683 SHA-256: d99ddca6d60301f4cb544c056d70260193943f40a0c01928c1a4e604fd615d60
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The document body, though partially corrupted, suggests a lure related to a 'Cholula all you can eat menu', likely to entice users to click on the embedded malicious links.

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
  • 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://traffnew.ru/123?utm_term=cholula+all+you+can+eat+menu PDF link annotation
    • https://nelotimef.weebly.com/uploads/1/3/2/7/132740277/7017328.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/SjaRKxD/wisovukanunusanobodamigu.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/xhiggha/86349158271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489713/normal_5fefbf0cf1c5b.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/iagjgjf/fatutiposugusuwimufi.pdfIn PDF document text
    • https://walafikug.weebly.com/uploads/1/3/2/7/132740659/5289936.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/pA2gjQI/gutschein_amazon_bei_dm.pdfIn PDF document text
    • http://sewalenugebob.iblogger.org/baidu_browser_free_filehorse.pdfIn PDF document text
    • https://site-1249328.mozfiles.com/files/1249328/guide_for_british_citizenship_application_under_18.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/Jhasidq/weather_radar_nc_mountains.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5f9f17f443530.pdfIn PDF document text
    • https://site-1176302.mozfiles.com/files/1176302/human_resource_management_functions.pdfIn PDF document text
    • https://site-1199973.mozfiles.com/files/1199973/matthew_hussey_texting_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/Kh1TgdH/tabletop_games_list.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/disepaturat-fodala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujusojup.epizy.com/28879666191.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_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 4772 bytes
SHA-256: 01b35b0cc009ce7dee1aedcb895ec1189d11cd31b400f3b21001b061208c6d50
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 10860 bytes
SHA-256: fa38ad88f703ba806192bf004ad693a687ba5c442c781096db4663b666cdecc5

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