Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccca00b2456d5f34…

MALICIOUS

PDF

76.9 KB Created: 2021-04-01 23:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a9efba80f54e42894c1a0a5fb52ba5c5 SHA-1: 4e9532cd2685eb37ac9ea0503683b00d5fe72c06 SHA-256: ccca00b2456d5f34140a2c9628aecf23de95f5f10d10289aa8234e31199979e7
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear user-facing text. The presence of numerous external URIs and the ML classifier output strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/123?utm_term=canederli+allo+speck+e+formaggio PDF link annotation
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/zixuwibavit_kuxukogofew_madop_lavuxesetoliwu.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/c2fbfe.pdfIn PDF document text
    • https://ridawixesij.weebly.com/uploads/1/3/4/6/134660161/dowuped.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/NhfEMja/shipwreck_grill_brielle_nj_08730.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/adobe_reader_for_windows_7_professional_free_download.pdfIn PDF document text
    • http://dududuw.mypressonline.com/77158250654.pdfIn PDF document text
    • https://jeradowekijulu.weebly.com/uploads/1/3/0/7/130739924/tatifimaxelusub.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/7jbhb83/t-_mobile_familywhere_cost.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/how_does_food_cooked_in_an_air_fryer_taste.pdfIn PDF document text
    • http://rabemedexisubis.mygamesonline.org/59928047611.pdfIn PDF document text
    • http://xalenupom.getenjoyment.net/bernoulli_s_theorem_download.pdfIn PDF document text
    • http://samekuk.22web.org/40245203548.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/HhgnYii/slot_car_racing_sets_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/fjjKjin/arabic_movies_apk.pdfIn PDF document text
    • http://vibijinit.scienceontheweb.net/automatic_exposure_control.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/classic_human_anatomy_valerie_winslow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_55140b042a464f5299c4a2fc65b62de3.pdf?index=trueIn PDF document text
    • http://nujorowej.epizy.com/85350069396.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_e861b72c963b4687a01e457cfbb75126.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_53cfeee5834348939ea3c02350342830.pdf?index=trueIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_44e0341ff5eb4f328f46ce0b4cd883c8.pdf?index=trueIn PDF document text
    • http://rabepubi.rf.gd/ciencia_definicion_autor.pdfIn PDF document text
    • http://vegozuw.epizy.com/mufovaxav.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_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 5444 bytes
SHA-256: fc5e108c36117b84e7ed5d89c30cb6da4931c55db41edc7353edac1933a4e929
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 12020 bytes
SHA-256: ff8b6e374c11436b605ef177fdda393fa007c0d96a40d13a7fa149f4e899c1ed