Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fcb64e26cd1ff4…

MALICIOUS

PDF

79.6 KB Created: 2021-02-07 09:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 895bb69921dd015cfc6495e11357cb1f SHA-1: 8c7d7a0c7bd02fcae465cb1333d1bdfe574c2f51 SHA-256: d7fcb64e26cd1ff49f78ba8d3ad5bd3b12c771a376688f279ea022df2fa7ae64
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on potentially untrusted hosting. While no scripts were explicitly extracted, the nature of the embedded links and the PDF format suggest potential for JavaScript execution to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wb?keyword=anushka%20photos%20come PDF link annotation
    • http://livethailand.fun/isaac_albeniz_granadacrcl5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_5fdb0cb9c3297.pdfIn PDF document text
    • https://cdn.sqhk.co/zakikola/Q1Jjduh/tiny_pixel_dungeon_guide.pdfIn PDF document text
    • http://tesocoin.online/syllabication_rules_in_english1obqa.pdfIn PDF document text
    • https://cdn.sqhk.co/nulogoxeja/ajdeiaM/46425078985.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/bgh8icH/pikmi_pops_surprise_jumbo_dog_plush.pdfIn PDF document text
    • http://lifegirls.site/flying_birds_sound_effects_freenr850.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/he6gj4R/koxitadusazas.pdfIn PDF document text
    • http://ilkertr.shop/21768625882bfxik.pdfIn PDF document text
    • http://boost-store.net/importance_of_kinesics_in_communicationxav4q.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/nKhijjX/vanabirig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470553/normal_5ffdb9306eb5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373987/normal_6006ef580fbc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/best_bike_racing_game_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/femotojapunu.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/tuxajimaxifabivezi.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 5096 bytes
SHA-256: 15cec17ec882264f27c61bde06f99de0486c7682ea004c64dc474a3010bd164c
font_01_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 2656 bytes
SHA-256: dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5
font_02_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 3048 bytes
SHA-256: 1b68eb0745f369bd9f805b89718582bd6ebaf917deeaaae5095027b3f32dc7b8
font_03_sfnt_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 2108 bytes
SHA-256: 806d12f4c18e044784d20764d58024893796e88f204c306662924b3e907cbcac
font_04_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 11492 bytes
SHA-256: 3005932a798c9d5fafa44019c285db49d94ab0c3c7d16dd8e6af548b07a5617a

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