Malicious PDF — malware analysis report

Static analysis result for SHA-256 d315e511bb11fd6a…

MALICIOUS

PDF

92.3 KB Created: 2021-04-01 02:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b117c6db882975255bacc159b3e03241 SHA-1: 087942c5f3fa39889b9a576f4a53eba76e225d86 SHA-256: d315e511bb11fd6a6f047415abcd538db83492689290625f82cbe1964da20380
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting, indicating a link farm for traffic redirection or malware distribution. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to a voter guide, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=los+angeles+progressive+voter+guide+2020 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_600559c23cab3.pdfIn PDF document text
    • http://pasetbs.xyz/112538131340k1cd.pdfIn PDF document text
    • https://gavuzidawosowek.weebly.com/uploads/1/3/1/4/131413418/d191a1045a1e91.pdfIn PDF document text
    • http://voicebftyi.com/graph_theory_handwritten_notesv1nbj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5fda232844fb1.pdfIn PDF document text
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/3891407.pdfIn PDF document text
    • http://scriptbook.xyz/2923014742026vp3.pdfIn PDF document text
    • https://navubenawegef.weebly.com/uploads/1/3/4/3/134320789/gevubisanopido.pdfIn PDF document text
    • https://gurugurib.weebly.com/uploads/1/3/1/3/131384113/sigovanaz.pdfIn PDF document text
    • http://zdsshop.top/stack_on_24_gun_safe_door_organizer7kwqw.pdfIn PDF document text
    • https://tenadugal.weebly.com/uploads/1/3/2/7/132740541/girom_fugesazadexez_viwirimumi_siworositik.pdfIn PDF document text
    • http://desepevadijowu.22web.org/meningeal_carcinomatosis.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/jcb_1cx_manual1myqz.pdfIn PDF document text
    • http://berimigigo.22web.org/aprender_ingles_facil_y_rapido_gratis.pdfIn PDF document text
    • http://naturebiolog.fun/mogadubv0cl.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/bixediluz.pdfIn PDF document text
    • http://macsk.space/iron_man_android_game_freecz1yq.pdfIn PDF document text
    • https://lagukowimewalis.weebly.com/uploads/1/3/5/3/135335318/botokaxidox_selawaz_rezupudezepol_fupuxodoje.pdfIn PDF document text
    • https://tababara.weebly.com/uploads/1/3/0/7/130739165/danakiwewoxumudifuz.pdfIn PDF document text
    • http://lyudi23.ru/college_and_career_readiness_standards_californiaggdie.pdfIn PDF document text
    • http://bristol-yalta.run/cambridge_primary_english_activity_book_1fzolz.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/magna_carta_text_latinx0el8.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://rejizupufuxetib.rf.gd/srimad_bhagavatam_book.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_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 5284 bytes
SHA-256: 79d488b483745d59b12faeac55bb12d70757c3798595672890f5afc9cff40b77
font_01_sfnt_off00012efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFC 11364 bytes
SHA-256: c3e0087172603129c31f2009300ca407c232fc83a5e3feeec3bc230a46300ce0
font_02_sfnt_off000155a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378