Malicious PDF — malware analysis report

Static analysis result for SHA-256 550b9d012844016e…

MALICIOUS

PDF

75.8 KB Created: 2021-05-28 12:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 010eb949906d4c75a12c68ed2fe7874a SHA-1: 15f9b21c00461c346ca939c024a5059364eba4f3 SHA-256: 550b9d012844016e8242dc0b59753688dd0fb0a4dc19b21c1f6f6a406bf522d1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=mazda+cx+5+2017+apple+carplay+upgrade PDF link annotation
    • https://dizugupixaxagoj.weebly.com/uploads/1/3/4/4/134440249/lirozifeninap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_603af74dce264.pdfIn PDF document text
    • https://baseparefawufif.weebly.com/uploads/1/3/1/4/131453046/2997860.pdfIn PDF document text
    • https://wusumojasojufe.weebly.com/uploads/1/3/4/3/134352244/ribadi-toresog-boxifaw-wutijujive.pdfIn PDF document text
    • https://dejoputaxili.weebly.com/uploads/1/3/4/7/134763817/e71ad.pdfIn PDF document text
    • https://kowedanu.weebly.com/uploads/1/3/4/6/134687265/wakilagedim-jekavabob-digowuvos.pdfIn PDF document text
    • https://xeludopoveju.weebly.com/uploads/1/3/4/5/134528604/3e3595d77.pdfIn PDF document text
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/tojojesud-pegod-xirogemo-melimeb.pdfIn PDF document text
    • https://zizozuku.weebly.com/uploads/1/3/4/7/134732263/visanonege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421613/normal_5fe2a02d4f155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_604388fc9782a.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/1640850.pdfIn PDF document text
    • https://luribexibaw.weebly.com/uploads/1/3/4/7/134750384/79fd34f32b5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_6023fe8a56905.pdfIn PDF document text
    • https://soregekewo.weebly.com/uploads/1/3/4/2/134266411/werusowuwuta-sasoxizof-mibal-fidegegi.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/9583602.pdfIn PDF document text
    • https://nivozigagu.weebly.com/uploads/1/3/4/4/134439663/pofodi.pdfIn PDF document text
    • https://vokejivig.weebly.com/uploads/1/3/4/3/134322053/fadorituma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/75dc7c1b-90a1-405e-b40d-f2bfaaf5177d/69156964337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f469fa-465f-4b90-996c-f2da91498778/samsung_grand_prime_pro_specification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab14d3a5-8bed-4337-8356-cac3ec36ddd9/suxelaraletebasefaloxif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092c210e-67c5-41ed-acd1-2e5df051b2f3/what_is_the_message_of_country_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e0322c-48b0-4ca1-b2ae-6793f167d78e/asus_x205t_replace_hard_drive.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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 5816 bytes
SHA-256: 92c45ec92f8e6fbadc06a671859fc958ab244a7e0aef60142ed809bd6b3074cb
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 11408 bytes
SHA-256: d607c143324bda15de03b091ff8caf11addffffd50e732cf5c08aee6e633d6c5