Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f6cf8fa48eba7d…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 21:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c2ff4a1d474a2c02c703b8c7b95c3734 SHA-1: 1cebf4a3fd9931688344229b6a656fa7e34833df SHA-256: 73f6cf8fa48eba7dac556c6e9283c8d46ddf53c40380654d737b555c52bd7cce
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable or suspicious domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the presence of numerous external URIs indicates an attempt to lead the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/wix?keyword=david+cook+permanent+american+idol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455684/normal_605abe8b5d037.pdfIn PDF document text
    • http://turodes.iblogger.org/33066497981.pdfIn PDF document text
    • https://nikupotipemami.weebly.com/uploads/1/3/0/9/130969226/1e61f6a2c87a3.pdfIn PDF document text
    • https://sizojupitad.weebly.com/uploads/1/3/4/3/134332657/duwuv.pdfIn PDF document text
    • http://argo-tourism.com/97117598876k9m1l.pdfIn PDF document text
    • https://nakoginav.weebly.com/uploads/1/3/0/7/130776809/xiliwudumafipuz_luxoguzanabepur_napijulugomol_jagatal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_602bf398cd22c.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/fundamentals_of_catholic_dogmaccrlm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_6052a65c2274b.pdfIn PDF document text
    • https://kejifesabateg.weebly.com/uploads/1/3/4/8/134847793/9606024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_5fd822b125041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_602cd9c486020.pdfIn PDF document text
    • http://lusatesarisabag.iblogger.org/cbse_class_10_english_language_and_literature_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_60474493a28e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_5fe848ea72fd0.pdfIn PDF document text
    • http://stassikorskyi.com/gratuity_payable_in_balance_sheetnqiv5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_600d55297a76c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jozubukobuwaju.epizy.com/challenge_bhojpuri_movie_video_song_mp4.pdfIn PDF document text
    • http://gunijeru.rf.gd/regular_present_tense_verbs_spanish_list.pdfIn PDF document text
    • http://kipadijosepo.epizy.com/how_to_trade_trend_lines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6763396d-0aba-4250-9dfc-3e57700fb733/optiplex_780_power_supply_reset_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9ab898-d6b8-4b88-9f45-de5bd70f5686/what_is_organic_form_of_nitrogen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f887fc6f-4db5-4ebb-855b-66cda5ef937d/gagaxiwekikojewus.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_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 5164 bytes
SHA-256: 9037e58a777d871ab35331d342011a0fa52f37e29b86fc0042a73ed16881cb9a
font_01_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 11248 bytes
SHA-256: 9f83a8c1e461de0c9fcc7178a9b78223b8cfeb34c82c7912dfd0c881d4d959a4