Malicious PDF — malware analysis report

Static analysis result for SHA-256 9200a760e373b956…

MALICIOUS

PDF

86.9 KB Created: 2021-02-15 19:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 7e70590340c349f9db8eb2bcdca09890 SHA-1: c61644c3c27c3a4da822134ea9be502b3c3b808f SHA-256: 9200a760e373b95606a71316463c462e05e7e268aa494f4a97bf731711a71023
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and redirect to numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=movie+maker+online+download PDF link annotation
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/1075545.pdfIn PDF document text
    • http://1cats.space/94433504502jeaq7.pdfIn PDF document text
    • http://kulokozataxat.22web.org/depukixiwusegin.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/jebet.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/ff2a2953698b.pdfIn PDF document text
    • https://tovumanaxi.weebly.com/uploads/1/3/5/3/135392352/6503859.pdfIn PDF document text
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/diluzira-wowitog-modalemu-kawesubiw.pdfIn PDF document text
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/wexejomigezidufasu.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/00588956b25.pdfIn PDF document text
    • https://cdn.sqhk.co/zewezerezi/IsyLic2/arknights_tier_list_june_2020.pdfIn PDF document text
    • http://gloslides.com/tifepifiromamarqollu.pdfIn PDF document text
    • https://cdn.sqhk.co/gatidixon/ggjkmy0/world_top_10_offline_games_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/rowubuvuke/hgigtXQ/80377284081.pdfIn PDF document text
    • https://vanufutalolu.weebly.com/uploads/1/3/1/1/131164160/xawuxuxawesa.pdfIn PDF document text
    • https://suzagadagaxu.weebly.com/uploads/1/3/0/7/130775939/3608793.pdfIn PDF document text
    • http://air-calm2.club/tangled_2_movie_release_dateic8g1.pdfIn PDF document text
    • http://ukranews.site/gukaxunadufobopoxurehajyj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumezasaguruwu.epizy.com/rudra_cartoon_video_free.pdfIn PDF document text
    • http://gejujebiwibi.epizy.com/figaviredunis.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/balloon_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/android_imageview_set_bitmap_from_url.pdfIn PDF document text
    • http://xatabiraluxuded.rf.gd/3134966928.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 14308 bytes
SHA-256: 811d1feefd75dc5925c0248f328e4aa35b9471ecbae854dd6d4f8709df59ccfc
font_01_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 5016 bytes
SHA-256: f62e39acb2e6c0d1ed5f097b2b71bec85fabb86af75479331c19d7485497d62e
font_02_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 11184 bytes
SHA-256: 9526d8aa7715bd646dc75e2741f45c985166504283752a2689f3e5ce2fb9cb4c