Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6a48a5dc1f95b6…

MALICIOUS

PDF

82.7 KB Created: 2021-04-04 01:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0f6a16d2d556509d3d1c3c344f59fd15 SHA-1: 2285682254c7080362b69925dfcddbd9693d1faa SHA-256: be6a48a5dc1f95b6924e5abe965e03187fc9ad798a5e4105d88328b750926729
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body appears to be heavily obfuscated or corrupted, but the presence of links and the heuristic firings suggest the primary goal is to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=teenage+christian+books+pdf In PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/ibYAz0I/calamansi_find_friends_among_us.pdfIn PDF document text
    • https://cdn.sqhk.co/wixadigizal/rnhbXjj/full_quran_translation_in_english_download.pdfIn PDF document text
    • https://mapobosani.weebly.com/uploads/1/3/4/3/134385232/tivajotusujavosuku.pdfIn PDF document text
    • https://cdn.sqhk.co/kojagopomon/gjhxoII/simple_carousel_slider_jquery_free.pdfIn PDF document text
    • https://vexuneka.weebly.com/uploads/1/3/4/5/134584550/tekurutimerurape.pdfIn PDF document text
    • http://rifikelatukuw.iblogger.org/lightroom_cc_alternative_android.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/7jgdrZP/yellowstone_season_4_netflix_release_date.pdfIn PDF document text
    • https://zujakeme.weebly.com/uploads/1/3/4/0/134041616/e64282b7b.pdfIn PDF document text
    • https://goxanakevixi.weebly.com/uploads/1/3/4/8/134857001/6453787.pdfIn PDF document text
    • http://salukapebuke.iblogger.org/65769000525.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/lofetonabukot_zigafoxawoset.pdfIn PDF document text
    • http://tolisona.iblogger.org/ed_ing_adjectives_grammar.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/DJVZjce/kemibawu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bizepusozuj.epizy.com/does_ipad_pro_work_with_bluetooth_keyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/84711119739.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/bones_series_guide.pdfIn PDF document text
    • http://mogopubu.epizy.com/bitter_leaf_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/agneepath_1990_movie_720p_worldfree4u.pdfIn PDF document text
    • http://foxivowopejo.rf.gd/muscle_pharm_workout_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/ashton_sanders_agent.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/sagazifavazeminoxifoviwuv.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/netisiketalobezax.pdfIn PDF document text
    • http://nalosig.rf.gd/underwear_size_guide_uk.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_off000104f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 5536 bytes
SHA-256: ce5b0b089864ed6c8f5de8b5058d54db748c3915935893cb751ea5e669cc207f
font_01_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 10968 bytes
SHA-256: 04c1b30c5bfcce5d367d1b8d0373af1b683103a8f4f8406b45c0029221c8ce43