Malicious PDF — malware analysis report

Static analysis result for SHA-256 3180fd1f5371feb8…

MALICIOUS

PDF

82.8 KB Created: 2021-05-07 01:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3b8055a573b2e3b68ce5be1b73619401 SHA-1: a7e9d22006d539df2fc0be3e9383b3c5f9b0ba21 SHA-256: 3180fd1f5371feb820281c0842b7b6a073c3275ceb24569e129f5ea7b120fc0e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95) and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though truncated and obfuscated, indicates it is presented as 'reading comprehension practice 11th grade', a common lure for phishing or malware delivery. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to malicious content.

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.
  • 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://pelibifir.ru/strik?utm_term=reading+comprehension+practice+11th+grade PDF link annotation
    • https://lujuvikib.weebly.com/uploads/1/3/1/4/131406806/2293855.pdfIn PDF document text
    • https://sefagovat.weebly.com/uploads/1/3/4/4/134402874/decb2c70.pdfIn PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/viladusojigagumaw.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/c623a9.pdfIn PDF document text
    • https://dopabazimago.weebly.com/uploads/1/3/4/5/134591427/jatomixab_pivev.pdfIn PDF document text
    • http://wavolat.iblogger.org/dk_illustrated_oxford_dictionary_free_download.pdfIn PDF document text
    • http://xexejidabame.22web.org/acog_pap_smear_guidelines_algorithm.pdfIn PDF document text
    • http://nefritthebestthing.site/facebook.com_recover_passwordon53t.pdfIn PDF document text
    • https://diluzisapi.weebly.com/uploads/1/3/0/8/130814250/lejak.pdfIn PDF document text
    • http://lulikike.iblogger.org/android_stored_wifi_passwords.pdfIn PDF document text
    • http://sozerujodurepef.22web.org/converter_em_autocad_gratis.pdfIn PDF document text
    • http://twenty-promo2020.ru/utilitech_1_hp_portable_lawn_pump_manualocwl7.pdfIn PDF document text
    • http://afracheat9.xyz/download_latest_lucky_patcherldxun.pdfIn PDF document text
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/sobepuwoj.pdfIn PDF document text
    • http://bella24.xyz/zajubuniduvezln47y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://simufuravaged.rf.gd/how_many_miles_will_a_2005_honda_odyssey_last.pdfIn PDF document text
    • http://xuxerikafirin.epizy.com/43124609689.pdfIn PDF document text
    • http://lajixowamimexo.epizy.com/23296129537.pdfIn PDF document text
    • http://tazolupiviroliz.epizy.com/technically_wrong_sara_wachter_boettcher.pdfIn PDF document text
    • http://povoxuzewezida.epizy.com/2955621674.pdfIn PDF document text
    • http://rebikesumusosu.rf.gd/brand_awareness_social_media.pdfIn PDF document text
    • http://jizuwugi.rf.gd/eclipse_juno_java_decompiler_plugin.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_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 5516 bytes
SHA-256: cbd1dfd07b3a683960f63c4f98d26c37b23d1dbbeee1eb68f0abde5bf74723c0
font_01_sfnt_off0001175b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 10740 bytes
SHA-256: 5d90bccec4abd5d2805e684fd0fa90c33163647a8af6375e9b61300bd650a6b6