Malicious PDF — malware analysis report

Static analysis result for SHA-256 8388db935f26ea10…

MALICIOUS

PDF

72.7 KB Created: 2021-03-17 19:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b3e7889cf1eecf770a7289ff8514b348 SHA-1: df8804525d547f411587170b9683d07595eb2e38 SHA-256: 8388db935f26ea10e966f28746e90e6de29f7a76c0450383512ee5d7dd7ab3aa
186 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

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
  • 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://midufefew.ru/wix?keyword=america%2527s+history+8th+edition+chapter+notes PDF link annotation
    • https://jikabokuw.weebly.com/uploads/1/3/4/6/134658058/jijuzumilafujojur.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/if_formula_in_excel_2020_with_example.pdfIn PDF document text
    • http://bimiwefumukiv.22web.org/secret_worship_algernon_blackwood.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448547/normal_6045f2ae8fd03.pdfIn PDF document text
    • http://kazuwikeseduve.22web.org/famafesoporexobunejovano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_6041ac844a197.pdfIn PDF document text
    • http://savineme.mywebcommunity.org/organic_chemistry_reagents_cheat_sheet.pdfIn PDF document text
    • https://telexetobowu.weebly.com/uploads/1/3/4/3/134339901/muvamutobodake-xekovem-jonudej-jimejebu.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/931068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_6030fbcb08bdb.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/bifuzuselupipojuwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5fcf26f9a3d01.pdfIn PDF document text
    • https://dasibovuripuxub.weebly.com/uploads/1/3/4/8/134860981/muketad-xiwut-bojonanigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukorow.epizy.com/windows_7_pro_media_creation_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde6c9dc-e8b0-48cf-a1f3-9ad759ac9ce0/wofidax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ccb631-c918-482b-8f37-e5057aa6e630/68404083979.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_d2e3a6622fc140769ca54a40a0e5555f.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_2ff99ad09bb64187961b9d6b0e28fb2d.pdf?index=trueIn PDF document text
    • http://nerakovunimi.epizy.com/91522727636.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_5468d45ce6df40e79bbbc26782c8eb9b.pdf?index=trueIn 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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 5600 bytes
SHA-256: a781f58c6d39c0970353f5aae4f501aacdf26ce4ae41a0e120d1c78b41925559
font_01_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 10484 bytes
SHA-256: 1a65dc13a05b6450895ca520c186eb82af394532435553de1479337c1047193c