Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05db81871fb9c16…

MALICIOUS

PDF

66.9 KB Created: 2021-03-04 17:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ae3b5b53102bd9eda1709e8419fba811 SHA-1: 91d76e0cdf6c55430bd0fd94a3e5caee3839a330 SHA-256: c05db81871fb9c16a390106cc47e8691e8d8b5dd096e9e3a206b1f74518a90b0
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. The document body, though heavily obfuscated, appears to be a lure related to 'La fitness downingtown pa class schedule', directing users to external sites. The presence of numerous links, many on disposable hosting, suggests a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://golowaki.ru/wix?keyword=la+fitness+downingtown+pa+class+schedule PDF link annotation
    • http://xoxinusenavi.66ghz.com/axl_movie_bolly4u.pdfIn PDF document text
    • http://voninizi.iblogger.org/content_planning_worksheet.pdfIn PDF document text
    • http://vilelares.iblogger.org/html_to_word_converter_i_love.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suzujuvejis.epizy.com/girl_baby_name_list.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/vector_brush_background_free.pdfIn PDF document text
    • http://firumod.epizy.com/negamusekojodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7beb2890-9219-42b4-bd6e-ae023fa65955/simcity_4_free_download_softonic.pdfIn PDF document text
    • http://wazizofukukifog.epizy.com/honda_hrc216_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/79084034250.pdfIn PDF document text
    • http://wepexivir.epizy.com/lupedatimosuvuselumib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e81e4b9-974b-421a-a0d5-5364cd6dfa60/cateye_micro_wireless_setup_cc-mc100w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57416797-9ed2-44dd-8e9d-8fd1e3db3181/what_is_the_niche_of_a_mushroom.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/wukawutodapilojapisi.pdfIn PDF document text
    • http://xafazox.rf.gd/vilelefujajakegebomaxu.pdfIn PDF document text
    • http://koluriv.rf.gd/litotebevawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bdd21db-9605-44ab-9c7b-035088ef59a9/how_to_calculate_lattice_enthalpy_from_born_haber_cycle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a20b59a-c6b9-4537-8255-2ee2b16c4dcb/zujikawenasosawomekid.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/32659608193.pdfIn PDF document text
    • http://sevetise.rf.gd/gimme_gimme_gimme_abba_free.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_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 5356 bytes
SHA-256: 1fdc00b52c2611b7b68c90cd2b39104d766b71c22f8d713ff98bffd8ad37bedb
font_01_sfnt_off0000db2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 10312 bytes
SHA-256: 9a7778d42daff8515baa1977776b6a670d665837b5590e887a33e5681b3c5ae1

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