Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd1c5492d2e3a24…

MALICIOUS

PDF

77.5 KB Created: 2021-05-08 19:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7b15158f5d7efee606c1105fa14aaa7e SHA-1: 684e6cd96de4243289afef1aa180d83537145d7a SHA-256: dcd1c5492d2e3a24ef04c8fce3e7786f5017e94a5a1abbe3969deb1363ee724a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though obfuscated, appears to be related to the 'Zen in the art of archery essay' lure, directing users to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=zen+in+the+art+of+archery+essay PDF link annotation
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/df82125b73d11.pdfIn PDF document text
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/votusosepidonabujef.pdfIn PDF document text
    • https://gazelavulokar.weebly.com/uploads/1/3/4/2/134265358/povov.pdfIn PDF document text
    • https://gitasojozatoj.weebly.com/uploads/1/3/0/9/130968906/bb36e89b8fe58a3.pdfIn PDF document text
    • http://gvidilon.ru/gewemogbmdr1.pdfIn PDF document text
    • http://labiosdewonda.com/297522996375gz2a.pdfIn PDF document text
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/sukefobafofabitixexi.pdfIn PDF document text
    • https://bizuzekibokosu.weebly.com/uploads/1/3/4/4/134446479/nakadijufove-jewifelalolu-relekepewidaful-guvupevip.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://silvanozito.online/88160010773y637f.pdfIn PDF document text
    • https://kawavugin.weebly.com/uploads/1/3/0/8/130874435/wefibarokimolanitupe.pdfIn PDF document text
    • http://zesamoa.online/fikasutejojugebojiz9dfgn.pdfIn PDF document text
    • https://pukukadusese.weebly.com/uploads/1/3/4/6/134666137/nifogurol-purotiza-pawolugugoj-pojasobebav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba9dc33f-61c2-415e-8598-c57272458a21.filesusr.com/ugd/c05727_680e6ddb2e3f4d60bf56158e7fa6f89e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d39cc60-ce21-454d-ab64-0475c22c2c29/25122297266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f79907-c399-4d2b-bd07-d954170bc703/denon_avr_1910_no_sound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6374d3d-315c-48b0-8bab-aff8449c1050/tax_free_retirement_patrick_kelly_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32193724-61c6-4665-9f17-d9c5ef2738c6/midmark_m11_autoclave_troubleshooting.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_a04c0a263331484faa76f7f03f900ad9.pdf?index=trueIn PDF document text
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_7ff34c0a66614628ac957d745149a607.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb8a4ea-b34a-4e88-a5c6-3691f9e4eb31/how_to_win_every_argument_madsen_pirie.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_11e0b411dffe4da08d7547b341cce6db.pdf?index=trueIn 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_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 4996 bytes
SHA-256: 79626d811d9a6f16fdeb32b5cbed00023f99daded4d3dcef56c99709491a0599
font_01_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 14144 bytes
SHA-256: 29828a53ea1682e1a35e44204fb4dc63d9b7e81aac27f8c22c65557ba3d22148