Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ad7501716e820a…

MALICIOUS

PDF

72.2 KB Created: 2021-04-02 21:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 625d6f9691405b1b1bf10cd4f4399ddd SHA-1: 7e2df56d820613009e721e6ce2f8a5b4abce7597 SHA-256: 31ad7501716e820ac70ec30a284f822ee19dba60de2109344ccb298de65d73db
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of external URIs and a link farm suggests an attempt to redirect users to malicious sites or download further content. The document body, though heavily obfuscated, contains elements that, combined with the heuristics, point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/award?keyword=allons+y+2+pdf
    • http://jisetatiloro.scienceontheweb.net/tixoretagizub.pdf
    • https://cdn.sqhk.co/jebozibiru/gelggu5/muwanikafaxibuzonagururuv.pdf
    • https://cdn.sqhk.co/gapekozuwa/Yiem4ii/oklahoma_state_football_schedule_2020_tv.pdf
    • http://kimujedat.mygamesonline.org/50769971870.pdf
    • https://cdn.sqhk.co/pabelewexo/heBWChe/word_racers_cheat.pdf
    • https://cdn.sqhk.co/vedasukuki/eyJiQry/verizon_roadside_assistance_telephone_number.pdf
    • http://vijepuwobewi.mygamesonline.org/patofisiologi_abortus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_0626aae8a32e4ab08ae15b989255eb42.pdf?index=true
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_71024eb9f3ef48f99327982b7f7eddb6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b1fcccb2-60a4-4203-a917-0ca9d220ac91/sony_hdr_as200v.pdf
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_fbaafafda8ef4be7981760030fe53c62.pdf?index=true
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_aa27b9ef32b446988fbf9d1743523336.pdf?index=true
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_3bb936eba20049bc82915e205e49f151.pdf?index=true
    • https://uploads.strikinglycdn.com/files/803d9e13-cfee-4dbd-affa-f85979549f15/how_to_email_suntrust_bank.pdf
    • https://uploads.strikinglycdn.com/files/c9afda00-2fd2-47dc-8308-5674e2df3cef/15432370827.pdf
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_415c7560f7934e218c30d4824fc9d4df.pdf?index=true
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_3cf389e65ecf48f4a2d9d556e65cb7fb.pdf?index=true
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_8b09828dab834ccf80bbc9a1e7505f33.pdf?index=true
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_d6c11030becd40a181d5aec081777602.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0df4001c-d24a-4820-bd84-8ec3362ece65/full_moon_night_quotes.pdf
    • https://uploads.strikinglycdn.com/files/23f57e86-b410-493b-8201-7c6ae73e8cef/how_to_evaluate_taylor_series.pdf
    • https://uploads.strikinglycdn.com/files/28be6e9a-0a10-4c55-818f-3f976372e5e8/best_one_year_bible_reading_plan_app.pdf
    • https://uploads.strikinglycdn.com/files/8848dd50-6e94-4a99-b164-7aac2411373d/bissell_turboclean_powerbrush_pet_carpet_cleaner_2085_walmart.pdf
    • http://votixeju.onlinewebshop.net/darikabogedele.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc3.bin
5a7a7060ae7650fe96e85a5401db9f94eb9b6f78c309f99e618a77f785cf5f10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 4952 bytes
font_01_sfnt_off0000ecca.bin
62771eca559b1adc7650f31e68f1f9a8aa3cdeab2b791d749240041c88741c63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 11008 bytes

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