Malicious PDF — malware analysis report

Static analysis result for SHA-256 2355d50a09f29dbf…

MALICIOUS

PDF

78.0 KB Created: 2021-02-19 11:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8bc97dbec517fffcd0f2eb4380028f13 SHA-1: b6a422578a9dfa6028e7177731f1d1c00ed3fcca SHA-256: 2355d50a09f29dbf286917296472dc3e5368105286c989bf2221a0553dc79750
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs point to various domains, some of which are flagged as disposable hosting, reinforcing the link farm and potential distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=navien+240a+error+code+110 PDF link annotation
    • http://normal-id.com/joyful_joyful_we_adore_thee_sheet_musicjktaj.pdfIn PDF document text
    • http://purpless.vip/23773367007di8fl.pdfIn PDF document text
    • https://cdn.sqhk.co/reruzemafow/NiggjWC/77995623877.pdfIn PDF document text
    • https://zuzoperelalame.weebly.com/uploads/1/3/2/6/132683259/8771167.pdfIn PDF document text
    • https://sorudexene.weebly.com/uploads/1/3/1/3/131384015/xaxiserivop.pdfIn PDF document text
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/56516f5c577.pdfIn PDF document text
    • https://zalajugimawif.weebly.com/uploads/1/3/0/7/130739284/8263707.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogudexo/haZYigd/lemakade.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/eonOkjf/padajiwafexavore.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/ihdLiht/army_vs_zombie_universal_mod_apk.pdfIn PDF document text
    • http://ogranicbio.fun/the_promised_land_piano_sheet_musiczot8h.pdfIn PDF document text
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/nabuk-pipora.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/dezokolixuwefi.pdfIn PDF document text
    • http://snt-br.ru/present_continuous_exercises_for_adults_upper_intermediatee6iqt.pdfIn PDF document text
    • https://rusiwenul.weebly.com/uploads/1/3/5/3/135327855/vadepex.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
    • http://bapatan.rf.gd/storyboard_that_app_download.pdfIn PDF document text
    • http://zalolod.epizy.com/choices_hack_without_app.pdfIn PDF document text
    • http://lafugigolemetuk.rf.gd/minji_malayalam_album_song_ringtone.pdfIn PDF document text
    • http://kixukad.epizy.com/semillas_de_sesamo_integral_informacion_nutricional.pdfIn PDF document text
    • http://disupenepoka.epizy.com/slope_intercept_form_practice.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_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 4876 bytes
SHA-256: eb61acdaad6b2e2e7d3361a1dfa5e60fb684e5a35dd4515a7101628ed8dc7d2e
font_01_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 10148 bytes
SHA-256: ff59498d09c9cd67e0a628cc1095571ff894b030808a02605bb3006fba6d8ade
font_02_sfnt_off00011cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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