Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3afae428965e945…

MALICIOUS

PDF

83.3 KB Created: 2021-03-24 16:31:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0f83ccfb61aefe4b4efda54371c03977 SHA-1: 7f11c08fb247737355509626e16801cd8d9ae629 SHA-256: a3afae428965e945aa17c25e550887caf52a802e197cfccc0c62b004981d244b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable or suspicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=fiber+cement+cladding+sheets PDF link annotation
    • https://dexasarejujevi.weebly.com/uploads/1/3/1/4/131454537/jagonalavagulesowida.pdfIn PDF document text
    • http://halfraire.xyz/how_do_you_swap_tiles_in_scrabble_gorfwkm.pdfIn PDF document text
    • https://radixukawatezod.weebly.com/uploads/1/3/4/6/134645496/zogukudoteg_gubukikuwagi_gadenidota.pdfIn PDF document text
    • http://trickyturkey.com/vewevovadodipilebuuiiww.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/f51a1b87.pdfIn PDF document text
    • https://veranaza.weebly.com/uploads/1/3/4/6/134665567/kunur.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/de_que_trata_la_novela_la_ciudad_y_los_perros1wpcu.pdfIn PDF document text
    • http://shopee24.site/85895429177nibq8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://legipugubawaw.epizy.com/change_ink_cartridge_hp_deskjet_1512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a767c4d-d2a3-46fc-9039-e5b96eeb4754/fluke_networks_ms2-ttk_microscanner2_pro_termination_test_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/50442968472.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/12111984262.pdfIn PDF document text
    • http://dupubavamuwoxaz.rf.gd/dativopufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b330f167-2aff-44e2-a7a9-432f6202dfd6/juz_amma_syaikh_sudais.pdfIn PDF document text
    • http://vigibuvene.epizy.com/tyrolia_adrenalin_review.pdfIn PDF document text
    • http://bajobakokela.epizy.com/26503212875.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/38393557029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a7472f-723d-4eb2-b376-d59833617b6c/the_distance_between_us_kasie_west_sequel.pdfIn PDF document text
    • http://sofijorube.rf.gd/rotisolijodoj.pdfIn PDF document text
    • http://wikidupuzok.epizy.com/bootloader_samsung_galaxy_young_gt_s5360.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_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 5448 bytes
SHA-256: 8972a3faf7d4efa96791b175946421914e61cca872e92d3b420e870a57796ec3
font_01_sfnt_off000119d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 10892 bytes
SHA-256: e53a54e4620c265598ace82ecac9fc061ecb474f3bd98a0b8633ea4ce6a4834e

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