Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cceb26a870dd99…

MALICIOUS

PDF

78.1 KB Created: 2021-03-16 10:38:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb53cb1ff29d9a0840d4dd868f99168f SHA-1: d7f7af3f5a403e22db81030c23787c9cc4376926 SHA-256: b0cceb26a870dd9941d3e07839ed519bc13290800038eaf551af9bffd94292b7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or distributing malicious content. The heuristic PDF_SEO_LINK_FARM and ClamAV detection indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The document body, though partially corrupted, suggests a lure related to decorating shoe boxes, which is likely a pretext to drive traffic to the malicious URLs. No scripts were extracted, but the presence of many external links points towards a downloader or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=como+decorar+una+caja+de+zapatos
    • http://hermidkovo.info/android_9_v_10mt203.pdf
    • https://cdn.sqhk.co/sarowojep/9Knggif/9892355806.pdf
    • https://cdn.sqhk.co/zolokike/ygdiaif/97754601069.pdf
    • http://xupulakikovuxo.mypressonline.com/xipepe.pdf
    • http://50offshop.pro/lifapazuugpio.pdf
    • https://cdn.sqhk.co/fotinegataso/jbSZ7ri/marco_polo_restaurant_menu_limerick.pdf
    • http://davupopebuwiser.sportsontheweb.net/jogging_stroller_that_fits_chicco_keyfit_30_car_seat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_e4f01c785576441ab9e63494eb67a156.pdf?index=true
    • https://s3.amazonaws.com/vatosolikijike/6625117211.pdf
    • https://s3.amazonaws.com/rovuweraja/kurakejijonovobadavuxoju.pdf
    • https://s3.amazonaws.com/gelawiweza/what_does_the_phrase_dead_in_the_water_mean.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_0dbb45f4a9d14552902d1f576c900657.pdf?index=true
    • https://s3.amazonaws.com/jajuzasalikirut/fipowovimijuwatu.pdf
    • https://s3.amazonaws.com/fujadabez/isa_control_systems_engineering_study_guide.pdf
    • https://s3.amazonaws.com/gurafoga/what_is_active_listening_in_music.pdf
    • https://s3.amazonaws.com/jaloto/math_test_calculator_4_answers.pdf
    • https://s3.amazonaws.com/jesidofefe/how_to_clean_rowenta_handheld_steamer.pdf
    • https://s3.amazonaws.com/nazekisigiduz/the_story_of_arthur_truluv_chapter_summary.pdf
    • https://s3.amazonaws.com/sobaketemu/66865641660.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb07.bin
00d5617663c0a488c8858249513058acfa9a0b41e8ed67c1d5de72af939a321d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 5220 bytes
font_01_sfnt_off0000fcac.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 1800 bytes
font_02_sfnt_off0001053a.bin
db40853afa74087496c72eb754f9ecaa7094dea39519f2f75c771ae808b9cea3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 11632 bytes

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