Malicious PDF — malware analysis report

Static analysis result for SHA-256 6841cbca512fbe30…

MALICIOUS

PDF

79.0 KB Created: 2021-05-09 20:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d7c1b258eccb2022fd1f2e484656a2ed SHA-1: b76440dc9a114a08661f8c379d7d115a72676627 SHA-256: 6841cbca512fbe307110ff26b56acbfb090d8a15a51a8b205d2a0a94570eb7bd
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized PDF files, suggesting a link farm or phishing lure. The primary redirector URL, 'https://nipisod.ru/strik?utm_term=wagner+250+paint+sprayer+manual', is used to disguise the malicious intent as a manual download. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=wagner+250+paint+sprayer+manual PDF link annotation
    • http://wixujikubipom.mygamesonline.org/safuwarelowaparazubupir.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/wumedosovavud.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/mcgraw_hill_physics_11_textbook_online.pdfIn PDF document text
    • http://betifogolejom.iblogger.org/aurelios_menu.pdfIn PDF document text
    • https://piloseweme.weebly.com/uploads/1/3/4/4/134491853/gedasopuzonisujoded.pdfIn PDF document text
    • https://jibowosiz.weebly.com/uploads/1/3/4/6/134632869/9875738.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/89223606479.pdfIn PDF document text
    • https://nunokewapi.weebly.com/uploads/1/3/5/9/135961733/rowufusij.pdfIn PDF document text
    • http://vedoluzomo.iblogger.org/61187835321.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/nokiva/gubebuxemefe.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/duzafudovebiso.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/de_pulgadas_a_centmetros_conversor.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/what_does_50_to_1_gas_oil_ratio_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/mikixejitam.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/python_string_format_get.pdfIn PDF document text
    • http://foduvikedumule.rf.gd/detotaxawomatokube.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/job_interview_conversation_in_english.pdfIn PDF document text
    • http://nunejodututote.epizy.com/38903111869.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/krups_ice_cream_maker_gvs1.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/how_to_find_unit_product_cost_using_activity_based_costing.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/balsam_fir_leaf_information.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/biblia_de_estudio_herencia_reformada_chile.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_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 5652 bytes
SHA-256: 1a7b95a4d8a8097658d66888b721828b58fdbe4a136e557ed8325bdb45605040
font_01_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 11564 bytes
SHA-256: c9d815547f0679f154dbdc6ce87fe9e0c5c5084c3b791ea9700c397a442fb896

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