Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a74d1f12d8e42f…

MALICIOUS

PDF

79.2 KB Created: 2021-03-23 00:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2e3bf448a2cbede6aa77581fd85c5fc7 SHA-1: c7f2fb3e1bac7b9f6245e4d7523caa1ca9f7515e SHA-256: f7a74d1f12d8e42f8100fabd2a42be7176a7ae18fb8c472222ff2076fbaa4f8e
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'explaining oxymorons worksheet answers', which is likely a pretext to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://ponafet.ru/123?utm_term=explaining+oxymorons+worksheet+answers PDF link annotation
    • https://modibidusez.weebly.com/uploads/1/3/4/0/134096811/fufufijug.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/5icghgf/green_the_planet_2_best_weapon.pdfIn PDF document text
    • https://fizilotot.weebly.com/uploads/1/3/6/0/136050642/fd41ed89a40cb0.pdfIn PDF document text
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/0cf3e5e476d.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/nolamodagixigodeguki.pdfIn PDF document text
    • https://weduxuvup.weebly.com/uploads/1/3/4/3/134308116/repowerenutadel.pdfIn PDF document text
    • https://gadevonetikob.weebly.com/uploads/1/3/4/3/134358307/43dc71a777704.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/08b7e7c.pdfIn PDF document text
    • https://kekoluborefox.weebly.com/uploads/1/3/5/3/135327445/wewiniwu.pdfIn PDF document text
    • http://fixalab.22web.org/present_simple_adverb_of_frequency.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/chjhbge/46155369740.pdfIn PDF document text
    • https://zokofefedepop.weebly.com/uploads/1/3/1/4/131437243/zuvegexuzulofa.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/jgeiaje/78848954540.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/jiidhhR/ninja_blender_parts_bl610.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kubafezin/john_deere_l120_parts_list.pdfIn PDF document text
    • http://punegisegavugaf.epizy.com/utd_psychology_degree_plan.pdfIn PDF document text
    • http://watijosanowo.epizy.com/cadbury_silk_song.pdfIn PDF document text
    • http://vokesakogo.onlinewebshop.net/fobalokuzodafevu.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/how_do_i_hack_a_vending_machine.pdfIn PDF document text
    • http://sibubixusa.epizy.com/17290001787.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/jujilotezijifinun.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/84746197078.pdfIn PDF document text
    • http://sexililelaweru.rf.gd/esl_food_label_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/jebaduwuvomubife.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/how_many_book_pages_is_50000_words.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_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 5516 bytes
SHA-256: 5d4152c41d989c157f01a864e091f54a026648717ff5db8a31a608e7758ba656
font_01_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 10488 bytes
SHA-256: e96fc45937db6d809cdb7b569d5bb0fa1e75587f65d517d66317a8f50052d975

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