Malicious PDF — malware analysis report

Static analysis result for SHA-256 7405c11c53d9eb4d…

MALICIOUS

PDF

76.3 KB Created: 2021-03-12 14:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f1982b27ffd6feb8c8ea6319059a093f SHA-1: b12a64f8980e962ada645b9ebb21c70757151710 SHA-256: 7405c11c53d9eb4db32bd347b2bcdce19f9336f37ad4804b5131286a51358cd5
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious redirection scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=english+grammar+synonyms+pdf PDF link annotation
    • http://xeboxemovev.66ghz.com/angular_template_variable_undefined.pdfIn PDF document text
    • http://fenellalucynelle.info/572615589998vmkf.pdfIn PDF document text
    • http://babysampler.com/alopecia_areata_tratamientozbpdo.pdfIn PDF document text
    • http://ladukusuga.22web.org/33394479727.pdfIn PDF document text
    • http://pafexomat.iblogger.org/fraser_island_guided_cool_dingo_tour.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/7346309.pdfIn PDF document text
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/xugobaxuneju_zanuno_lugexun.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/84f5f.pdfIn PDF document text
    • http://wonder-ita.fun/kajisewup2a.pdfIn PDF document text
    • https://zowukudikumo.weebly.com/uploads/1/3/1/3/131382828/sutarulupuwisub_vigubujunapojan_vuxugelaxuteti.pdfIn PDF document text
    • http://indital.space/anthony_de_mello_awarenesspuylu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_b5de6d87a53e4cd385ec600f1f6fbb92.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_7d656bc171e8471685cfc250a2e47082.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/giwejanasikuku.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/amazing_world_of_gumball_goodbye_song.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_7500456e28eb497baf999509c1839544.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_e4fa28401a9949ecabd7ebec0ece40a6.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_f053e1d7e136449991dd0ee7bf89ea6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/dropper_maps_for_minecraft.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_c1d01b79ea1c4f658a444c0a1ed9225e.pdf?index=trueIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_e547f465d5e6476f8817c8c9e3be45a7.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_3e2db94500bd4d17b3e68092efbfa619.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paropabaru/137963932.pdfIn PDF document text
    • http://tubupokus.rf.gd/gigajonut.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_8265d2948d1a42509c6db4ddf89948b8.pdf?index=trueIn PDF document text
    • http://kuviwobabevi.epizy.com/abraxane_us_prescribing_information.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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 5512 bytes
SHA-256: 56792ffe20908bb60707f3a14c7e7a517f578acd97eab794290d2fd31d7bce46
font_01_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 10620 bytes
SHA-256: 469a42c0b5ee218275defc26364deecdee9784f79c12e57651079e41352a5694