Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade7c1066d67d0e9…

MALICIOUS

PDF

76.3 KB Created: 2021-04-07 03:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e1e990fadc421677f9b982f0df719ba SHA-1: a167c7f70d9c54340fa12ea3b343a537aba7beef SHA-256: ade7c1066d67d0e9edcbb90048ee3a82de0311d3401e795aaff05c47eac81fcd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to a link farm containing numerous external PDF links, with one prominent URL being 'https://bologen.ru/award?keyword=how+to+make+money+book+pdf'. This suggests the document is designed to direct users to potentially malicious websites, likely for phishing or malware distribution, masquerading as a money-making guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=how+to+make+money+book+pdf
    • https://static.s123-cdn-static.com/uploads/4370263/normal_5fcb49e821085.pdf
    • https://static.s123-cdn-static.com/uploads/4380211/normal_600108472a4a2.pdf
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5feb69e0eae19.pdf
    • https://cdn.sqhk.co/zijikunu/gd1jjY0/vosor.pdf
    • http://knitfqph.site/kapansrlop.pdf
    • https://cdn.sqhk.co/bisuligiga/ahdWgjl/fofuzivefazitemolonufudu.pdf
    • http://all-host.site/xijixowomanozuwonerotazaah2vd.pdf
    • https://cdn.sqhk.co/letaziseb/fhcykgc/hashtag_generator_free_facebook.pdf
    • https://cdn.sqhk.co/rubovadu/2wsijij/how_to_go_viral_on_youtube_dhinchak_pooja.pdf
    • https://cdn.sqhk.co/tibakekavero/HjjJEgf/winiwimu.pdf
    • http://idealicaitalia-ufficiale.site/helter_skelter_lyrics_and_chordsyx85h.pdf
    • http://mmamba.ru/milukejuregeramogemoj812jd.pdf
    • https://cdn-cms.f-static.net/uploads/4387571/normal_60137c8cc411b.pdf
    • https://cdn.sqhk.co/winogolelog/jfUhbXo/craft_guide_minecraft_1._12_2.pdf
    • http://csxmoney.info/whirlpool_wfc7500vw2_owners_manual7l7ch.pdf
    • https://cdn.sqhk.co/repipedifavi/5iagIFX/syberia_2_nintendo_switch_review.pdf
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5ff532c386922.pdf
    • https://cdn.sqhk.co/jusulikipe/ih5XOhj/85065383017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jeduzizonox/train_platform_number_and_coach_position.pdf
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_b517a73d1a50488c90535188efafe4b0.pdf?index=true
    • https://s3.amazonaws.com/rodiligarexo/how_to_win.the_lottery.pdf
    • https://s3.amazonaws.com/jiwisigetizoxif/29111836443.pdf
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_2f41a66f5b4a49b3a8f086389a1d0b23.pdf?index=true
    • https://s3.amazonaws.com/ragejufa/mejotegodin.pdf
    • https://s3.amazonaws.com/sutawowirosuvuv/input_attribute_form_html5.pdf
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_7e9b843e1633465d9098f805a40646b1.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25a.bin
bfd9a3db861ef78b472e0f35b5f097567d321fca739d4caa9760cd09c565b688		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 5240 bytes
font_01_sfnt_off00010433.bin
03e802fae9b3a82ef08b449b221d3ba435dcb36e4d8445984493428a81c42602		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 11288 bytes

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