Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a25158ac5e09f15…

MALICIOUS

PDF

83.1 KB Created: 2021-03-20 17:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 99f114163bac50b642918f2c36d9c460 SHA-1: ff61aa55d5f4b9a5c81baf4cefb8fd62cabc1874 SHA-256: 9a25158ac5e09f153418ea13d6c950af5eee50c5b2cf875672dbbc1fa35a4c60
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, indicates the file was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the phishing or malicious redirection hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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/award?keyword=adjective+phrase+and+adverb+phrase+exercises+pdf PDF link annotation
    • http://viewcreditscore.info/how_to_do_cover_page_for_research_paper_mla_formath1bbd.pdfIn PDF document text
    • https://nunigatomupava.weebly.com/uploads/1/3/4/3/134314222/sipupinil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447280/normal_5fe487e456677.pdfIn PDF document text
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/4266892.pdfIn PDF document text
    • https://zudezujom.weebly.com/uploads/1/3/1/3/131384555/mopubujojig.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/law_of_equity_and_trust_in_bangladesh.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/twilight_saga_book_set_amazon.pdfIn PDF document text
    • http://dinudavap.iblogger.org/34199882615.pdfIn PDF document text
    • https://sirubiruxegame.weebly.com/uploads/1/3/4/5/134581195/tuxejuxutawalizuwexe.pdfIn PDF document text
    • http://my-favshopc.online/flight_of_the_bumblebee_flute_letter_noteskyu1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_600c3975e240e.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/3870928.pdfIn PDF document text
    • http://vapufizap.iblogger.org/psychological_theories_of_addiction.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473892/normal_6019fff81ca9d.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/siwaxarutup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_602cb2cc03063.pdfIn PDF document text
    • http://mybestchan.online/the_street_ann_petryxrjdm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kowefejarozop.epizy.com/41293033613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0692332-6bdc-4c22-a636-62321866ebfa/monster_manual_4e.pdfIn PDF document text
    • http://deravamosu.rf.gd/james_montier_behavioural_finance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb826896-67d7-46ef-bea4-b0df17dca642/42568228956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac7dece-97af-4d87-9f68-39fa036e9f1d/quranic_arabic_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45d2119-69e3-4209-ace2-785fd5b90abe/45443504820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42bdb11-582f-436c-b7cc-368d1ced2bf1/vb.net_coding_standards.pdfIn PDF document text
    • http://peregal.epizy.com/chitralahari_songs_video.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_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 5220 bytes
SHA-256: 42487c91d60f5327f7e18a10102963df86f4bb4448a7b6626bab89f8fde8e313
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 10756 bytes
SHA-256: b3cd79f0dc8caa989baa366e5001566dc43d7510837be81955a699e8bfcffc69
font_02_sfnt_off0001308a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361