Malicious PDF — malware analysis report

Static analysis result for SHA-256 191cbfb1d06bb333…

MALICIOUS

PDF

92.3 KB Created: 2021-04-05 10:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c1dc504e3ee8e3574acce2c9e0adb7d3 SHA-1: 31046ec7d6fcbf14e884d5b813e96495d4530fe5 SHA-256: 191cbfb1d06bb333cdc39309b306b1c752d48ac3f0d56b33bc7721c56aefe7c0
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, indicative of a link farm or SEO spam operation. ClamAV and ML classifiers flagged the file as malicious, specifically as a phishing or trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://lozipotod.ru/wix?keyword=quadratic+transformations+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/definuseju/2Nt1GGb/zajekuvitoxusigejurusa.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvitatutuv/Kshejhz/age_of_empires_3_mobile_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/igjpnN8/art_therapist_masters_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/vTVEidf/38655742885.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/hfe8vjd/lonasitaputiduxiladev.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/58593379041.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/43633231875.pdfIn PDF document text
    • http://sweetygirl.club/how_to_open_vitapur_water_dispenserlj03k.pdfIn PDF document text
    • http://civiliscmq.online/therapy_interfering_behaviors_worksheet2fkw9.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/jiwuzemegutipipon.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/ghihdge/89173572764.pdfIn PDF document text
    • https://cdn.sqhk.co/nepozenilu/el8pheT/14318831858.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/iheM7hd/cute_helix_jump_icon.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/wopelivewuzelugejjc39.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/wigepiwisisegopedom.pdfIn PDF document text
    • https://zixikaro.weebly.com/uploads/1/3/5/3/135301636/soxoxifonadobu.pdfIn PDF document text
    • https://duwafozadujazak.weebly.com/uploads/1/3/1/3/131380008/jawesegexorovaf.pdfIn PDF document text
    • https://rolejiminuvaw.weebly.com/uploads/1/3/2/7/132740194/gifimemexoda.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/Jjd6Agh/49614698018.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://uploads.strikinglycdn.com/files/e002e92c-d06d-4836-ab90-d87e55516ab8/why_finland_has_the_best_education_in_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b010417-5637-4f2d-b51a-5468d434d94e/75423244987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f844b252-ec4a-42b0-98ff-0907dd78dbc6/sedadipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08282498-c280-4a80-a4ac-7d9fb2305c32/zafexakedaso.pdfIn PDF document text
    • http://nokejufesuw.atwebpages.com/bulixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0341ac22-3d22-45c8-b0ed-a26f030aba4a/88352708634.pdfIn PDF document text
    • http://tigagatu.atwebpages.com/21845830320.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 5464 bytes
SHA-256: 0f37b59623c68660131b3b98c65fb4fd5fa46a08b8676e14645b74e989138731
font_01_sfnt_off000117e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 11436 bytes
SHA-256: 863d16f4680b6b4fffe3450ae4143ee856ac1408481ce571ffe8b74d5d42abe3
font_02_sfnt_off00013f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1A 16368 bytes
SHA-256: ed80ac131c33f3bb804a15242af58d8680340fed71ee29519f86f2f1e989e549
font_03_sfnt_off000154f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378