Malicious PDF — malware analysis report

Static analysis result for SHA-256 d285038048e8894d…

MALICIOUS

PDF

83.2 KB Created: 2021-03-30 10:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b20fb6d0834a775096777701ce240273 SHA-1: 4992642b39e6a900cf88c7ef4cd8ed42aabd807e SHA-256: d285038048e8894d2899cf27f5c3880f5bfa60b703c314221e4bee7461bb8946
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous URLs points towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=what+are+the+functions+of+oxygen PDF link annotation
    • http://bidetoluji.getenjoyment.net/conair_steamer_gs95_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/fByieij/free_slots_77777_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464313/normal_5fd094ada6a11.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/hsgfgjr/vemenofupad.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/boise_cascade_lvl.pdfIn PDF document text
    • https://cdn.sqhk.co/birugafomafo/hiLw2jb/tebudasajofizoneweworu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_602715b7de314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_604b69ed3ec46.pdfIn PDF document text
    • http://xifutipixa.mywebcommunity.org/letter_of_intent_scholarship.pdfIn PDF document text
    • http://jogajep.medianewsonline.com/calculus_2_kenyatta_university.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460071/normal_6004bfcacb17a.pdfIn PDF document text
    • https://cdn.sqhk.co/vonixilavot/0hbtPid/ninurorumatilukuweku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450624/normal_5fd1a72370f86.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/3iijc7h/14399018387.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/zhhH7hb/wilexugesowibijusare.pdfIn PDF document text
    • https://cdn.sqhk.co/nogugojuri/FsibEji/lawebi.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/jiFF8ib/simulator_of_usa_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_74f8a0f4c24242a8a70ed105016bec24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a4a2b8-e0bd-4eed-a88a-a915961ac044/how_to_answer_summary.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_6d995435f7da4f33b3e7cf4d79d65f1d.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_bbd65b556802425a9856541907ef5820.pdf?index=trueIn PDF document text
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_99d6f468cec843a0af4444df2945afe9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ec0ee8-39e1-475a-b976-b2afd352251f/rakubatirir.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/angelcare_ac401_baby_monitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35c4cfd-daac-4a9e-9cdd-aada3fea711b/sulemuxinemetokataxoxejo.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_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 5292 bytes
SHA-256: a5fae3b09ffe1b2665a31135d40be932b18ba74eecf6e6ab6bd83bb899f6645f
font_01_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 10604 bytes
SHA-256: 3ac7f6025fdfba84352cbd49b8669b966b615b4aa07ba95b72b85f32cb454c0d