Malicious PDF — malware analysis report

Static analysis result for SHA-256 c162a6eedc9a53ae…

MALICIOUS

PDF

71.8 KB Created: 2021-03-19 16:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4b78e7a6ebedcdbbaf029a80d071d0a4 SHA-1: b553a2841f9d456c2cbf9f82aee089fec8050b4b SHA-256: c162a6eedc9a53ae0df84746a2491046a79f1e5158b0c8f99521d4bbeb43fdbb
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to reference a study guide, a common social engineering tactic. No scripts were extracted, but the presence of external links and the high confidence detection indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xajibur.ru/wix?keyword=apologia+advanced+biology+module+16+study+guide PDF link annotation
    • http://cadenalia.com/statistical_mechanics_book_redditvfu9q.pdfIn PDF document text
    • http://oficialshoes.site/gfta-2_scoring_sheetfgerp.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/modilatewawu.pdfIn PDF document text
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/giroxipefukanot_nibodi.pdfIn PDF document text
    • http://zelopaqq.xyz/theoretical_framework_definition_psychologyynm2x.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/hieggji/towulibigefufemo.pdfIn PDF document text
    • https://zovakilezogavi.weebly.com/uploads/1/3/1/1/131163957/0b7cbb89f6626.pdfIn PDF document text
    • http://lp-consalt.ru/oster_blender_best_buym7zx2.pdfIn PDF document text
    • http://vodizurulenega.mypressonline.com/geographical_map_of_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/gji5ggf/bombay_bicycle_club.pdfIn PDF document text
    • https://cdn.sqhk.co/noxawuge/dhaahaq/mipabasororoke.pdfIn PDF document text
    • https://cdn.sqhk.co/vukixukafoga/62jgibp/botany_neet_questions.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/21100740337.pdfIn PDF document text
    • https://lisijinawap.weebly.com/uploads/1/3/4/7/134740049/jelug.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/bidopolemaxubo.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/ZToXyJI/wasitujojarufon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/siminosudomififeliw.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/peptic_ulcer_guidelines_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/878cfe76-8c87-459c-81bf-342ab54dea88/dizopakoguruxepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deac63c6-9710-48b8-910f-83c26c85a5cb/poetry_for_dummies_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4186518b-5097-4d09-99fe-371aa8279ae0/what_if_god_was_one_of_us_lyrics_alanis_morissette.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/godizulodajibisajafojix.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/febamizazezip.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/70491229938.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/tax_amnesty_scheme_pakistan_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/74137821205.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_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 5792 bytes
SHA-256: 5e070dfc2effd125cfa809f86de1e9723b7cc78c6823809c085259a239635cea
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 10316 bytes
SHA-256: 505ae040ea535cab39cb8c01d1d4d4991532f98f0edf98e508e8c0cfac762769