Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87d0b6f5ced388a…

MALICIOUS

PDF

71.8 KB Created: 2021-04-08 04:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 73a28736b65284a6c884e9661d5a44d5 SHA-1: a5812ccd96f22ec5a9477496e6c1c6950d99d9e8 SHA-256: a87d0b6f5ced388ad05ffdf22ecab812a1eac09fbd82d299eb234c107ef0f4c6
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to educational content, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of malicious redirectors points to an attempt to deliver a secondary payload or lead the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=pearson+interactive+science+introduction+to+chemistry+answers In PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/norozujamojeka.pdfIn PDF document text
    • https://fajimidisuwa.weebly.com/uploads/1/3/1/6/131606183/womobewid.pdfIn PDF document text
    • https://cdn.sqhk.co/bodovukig/chhfhgZ/chrome_free_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/fesoxuleri/hiiargN/73147440649.pdfIn PDF document text
    • http://sabeladiwuz.22web.org/murejodago.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/46yMAjh/49486406308.pdfIn PDF document text
    • http://steblin.pro/270357506928jndh.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/kubaj.pdfIn PDF document text
    • http://cmb-societe.com/bufabavulabirimod0elt.pdfIn PDF document text
    • http://springital.fun/83111839358y3m18.pdfIn PDF document text
    • https://cdn.sqhk.co/rejiwosujupa/ehbVUid/arjun_patiala_all_songs_pagalworld.pdfIn PDF document text
    • http://reduslim-sito.site/constipation_naspghan_guidelines27cy2.pdfIn PDF document text
    • http://am-sound.ru/are_tomtom_lifetime_map_updates_free71sf7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zexozavo/44741800684.pdfIn PDF document text
    • http://sibedegaxuwo.rf.gd/hssc_admit_card_direct_link.pdfIn PDF document text
    • http://zefumegidadaj.epizy.com/51529126509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e48450f-6857-480d-8abe-2f2575aa2b5f/john_gardner_grendel_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/19974532360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f115c7-5d4d-4273-847a-78022ea38d3b/1980_troy_bilt_horse_tiller_belt_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a1d61d-36e7-48db-8860-6eba83ef727f/25747051720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce8187a-7ef5-4c29-84b0-c799dc7062b8/why_ethanol_has_a_higher_boiling_point_than_dimethyl_ether.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7729162-deb3-4707-b545-316b36297627/how_to_set_instant_pot_for_hard_boiled_eggs.pdfIn PDF document text
    • http://pizubape.rf.gd/fundamentals_of_electrical_engineering_ii.pdfIn PDF document text
    • http://lujifub.epizy.com/52761486481.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/33515668307.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 5284 bytes
SHA-256: 10405001934c05895ad785bdae787ad9dac52b576aa4ca9d90debcf3d7781ebb
font_01_sfnt_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 10040 bytes
SHA-256: f45fc4ef7f66ef2f84c52805f1ae2a412b14416a80829b117d32a3e82b17b634
font_02_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.