Malicious PDF — malware analysis report

Static analysis result for SHA-256 833858f18a47bfa1…

MALICIOUS

PDF

77.2 KB Created: 2021-04-01 20:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3613a57536a3360364bfbe49755eb34f SHA-1: 03b33b2efa26facca2e91356d51108b206ddb7d2 SHA-256: 833858f18a47bfa114214f74bbdc483fc7f07d1485f54c1cff13c1783735cca4
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm and a redirector pointing to 'gb whatsapp pro apk latest version', suggests a phishing or social engineering lure. The document likely aims to trick users into downloading malware or visiting malicious sites under the guise of providing a software download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/123?utm_term=gb+whatsapp+pro+apk++latest+version PDF link annotation
    • https://defupodanujazi.weebly.com/uploads/1/3/5/3/135346118/bobedesibur.pdfIn PDF document text
    • https://jowanubeso.weebly.com/uploads/1/3/5/3/135399775/1c849b7dc94b89.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/jopenipugozomo_tipofaviribid_venuka.pdfIn PDF document text
    • https://gawujura.weebly.com/uploads/1/3/5/3/135325150/1178710.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/sepukiwigaro_zezezafesutifu_goboteluj.pdfIn PDF document text
    • https://modurofeg.weebly.com/uploads/1/3/4/3/134376635/6045b0a29.pdfIn PDF document text
    • https://fuwipinax.weebly.com/uploads/1/3/4/0/134016709/dbda913412c.pdfIn PDF document text
    • https://didipovewefof.weebly.com/uploads/1/3/4/3/134306756/edcaefb0831a801.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/roginawalid.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/vonolubosu.pdfIn PDF document text
    • https://wujupeduluruwuv.weebly.com/uploads/1/3/5/3/135316277/jujofusazewe.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/5792844b5.pdfIn PDF document text
    • https://duwujesipegon.weebly.com/uploads/1/3/4/8/134883919/c563ed05.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/peledapol.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/fajonubinomeder/43686347663.pdfIn PDF document text
    • http://mafuwiwoxosom.rf.gd/bullet_force_apk_mod_money.pdfIn PDF document text
    • http://rarisirifamawod.rf.gd/29227455490.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/roxetokajusukinik.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/8399881655.pdfIn PDF document text
    • http://zibakogemigana.rf.gd/el_seor_de_las_moscas_audiolibro.pdfIn PDF document text
    • http://josotemasafu.rf.gd/zoology_notes_for_ias.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/commando_2_movie_songs_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/bimalolefufotinelo.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_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 5296 bytes
SHA-256: 8635093234aea2e8d4f76d7e70185338656eccacfb747efc96855b584dcd2623
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 11280 bytes
SHA-256: 10b8a26789000cf62db83c60d4a1900a3ef91722b6df310237e0992142fc1623