Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dfa7368bb3d863…

MALICIOUS

PDF

86.5 KB Created: 2021-03-30 02:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cca81d6cab934474cc9d851cbfb8ff65 SHA-1: c0600e419d3796ea8c19564426608ad417443ade SHA-256: f8dfa7368bb3d863edf255d55cc33f939600cd2cd280b50d23956315c5a2162c
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 lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://golowaki.ru/wix?keyword=pomba+gira+de+las+7+sayas+quien+es PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425917/normal_5fe02a84f3034.pdfIn PDF document text
    • https://ziwagugo.weebly.com/uploads/1/3/4/1/134131511/kunofef.pdfIn PDF document text
    • https://wepizowo.weebly.com/uploads/1/3/0/8/130813330/sikuwimuweri.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/motu_aur_patlu_ki_jodi_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490252/normal_5fd76c0bc96ba.pdfIn PDF document text
    • http://kunabote.22web.org/wewisiminowanugavuk.pdfIn PDF document text
    • https://latoratepowubum.weebly.com/uploads/1/3/4/7/134713938/9922612.pdfIn PDF document text
    • https://weneboremuneje.weebly.com/uploads/1/3/5/3/135317625/9dd3b03.pdfIn PDF document text
    • https://vufujisuwe.weebly.com/uploads/1/3/1/4/131437295/2919168.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/1d7c660d805e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490121/normal_60302d00107c1.pdfIn PDF document text
    • https://tapituxupali.weebly.com/uploads/1/3/1/3/131382330/5198356.pdfIn PDF document text
    • http://wutugavefezaza.22web.org/geometry_counterexample_worksheet.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/gerowizoromu-wilegofokot-zoxuge.pdfIn PDF document text
    • https://muzuwetabez.weebly.com/uploads/1/3/1/4/131483468/wifojinibesona.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449776/normal_5ff78d89cffe8.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/lejeneda-loluworufolabug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_6061a09a3d6c1.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
    • https://s3.amazonaws.com/bidemewufa/nerd_glasses_vector_free.pdfIn PDF document text
    • http://tunozesanapi.rf.gd/1336536774.pdfIn PDF document text
    • http://warunegiluj.rf.gd/57887017499.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/what_is_the_sound_of_a_tree_frog.pdfIn PDF document text
    • http://risawanidav.epizy.com/navra_bayko_marathi_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/four_times_tables_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/46395283216.pdfIn PDF document text
    • http://mibexaluji.epizy.com/80391262162.pdfIn PDF document text
    • http://fukasutatota.rf.gd/kirebinamepatilom.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_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 5396 bytes
SHA-256: 45e8e8c6decdd883be6a49c8c92c25e9e5e6ae618aa14f8b8d6e46356be4d064
font_01_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 12960 bytes
SHA-256: 965f591c95e80cd356bb981e65c38f647b0ca16d09872aabc9341f979c7bb967
font_02_sfnt_off00013be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e