Malicious PDF — malware analysis report

Static analysis result for SHA-256 7589cbb2ab522137…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 14:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ac0c1165bdae0ff41cfdde71838e880e SHA-1: 116b648ada81be944b2dde4bfa0225c9126f7fd5 SHA-256: 7589cbb2ab522137d580449ad277cc2cf5f3cbf146faed2aea8f1f1890e4dff0
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 domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. While no scripts were directly extracted, the nature of the link farm suggests it could be used to distribute further malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/aws?utm_term=jelly+roll+pillowcase+pattern PDF link annotation
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/wuruduwil.pdfIn PDF document text
    • http://itanto.space/509901954635igx6.pdfIn PDF document text
    • http://216tilford.com/13772769784h0uku.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/16311677922bh0a7.pdfIn PDF document text
    • https://magapevalapa.weebly.com/uploads/1/3/0/8/130874167/kemabusaniza_rejafojivipora_xuvatapelu_wafumewodatilow.pdfIn PDF document text
    • http://pusosokus.iblogger.org/75896395305.pdfIn PDF document text
    • http://maddot.space/learning_from_data_the_art_of_statisticsjrvuy.pdfIn PDF document text
    • http://elerctum.org/43326568225d0umb.pdfIn PDF document text
    • http://helpcopyright-service.com/444623243011hlr2.pdfIn PDF document text
    • http://hookup666.site/is_nuna_pipa_lite_compatible_with_uppababy_vistab60e3.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/44763bde-5682-47c6-b41a-38ab3c7e5b30/ninovosuzovexu.pdfIn PDF document text
    • http://reronagut.epizy.com/dofukoxulilegewuzabiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca973781-54ef-40da-ba68-117926c4d520/cuisinart_coffee_on_demand_12-cup_programmable_coffee_maker_dcc-3000fr.pdfIn PDF document text
    • http://feluwagosipo.rf.gd/gilosiluwotupezojove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3649d32e-bbbe-45ef-a82d-c6c17bbe217b/reflexive_verbs_spanish_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f368433a-a484-408d-8677-7226bac46a84/35271605429.pdfIn PDF document text
    • http://xogowakowokavuw.rf.gd/godipapesure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046eaad0-75f2-4a6c-92f8-a6fe8008d6f8/dunaxedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da692b60-0d27-40a2-88cc-c2290fafb229/wordly_wise_3000_book_10_lesson_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d53cf7e-79ab-47ce-97c7-d55040384f9f/unlimited_bowling_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca3dd8e-bcfa-4f92-8914-658fe94c5757/bogeruzewanagelejuzezerul.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_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 5112 bytes
SHA-256: 0487a428268c22a73dacae8a84e5b9606498df5a49780b2976beba044066d0a4
font_01_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 10712 bytes
SHA-256: c993d7ecbe62529dd1dcba7c7028608fd2bd3b4fbd21511595b6d8cd77390335