Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ecd3402f782022…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 06:04:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 681244dacdf9fed8845b4733defc85a2 SHA-1: 4af56414a0384897b22fc949cea5eaf3def44134 SHA-256: 58ecd3402f7820222e4a65f0048e427708bf68be6893bd96aafa006ca7f1b9f1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://bologen.ru/aws?utm_term=top+100+games+chart PDF link annotation
    • http://rewutudot.iblogger.org/imr_700x_9mm_load_data.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/gdwNih5/random_word_generator_python.pdfIn PDF document text
    • https://cdn.sqhk.co/pisimebuziz/ha2UheJ/janasedur.pdfIn PDF document text
    • http://subaxidubuju.22web.org/android_tv_best_web_browser.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/aANi2JF/34533191349.pdfIn PDF document text
    • https://cdn.sqhk.co/mowezeto/vRjaV0S/roll_up_ice_cream_and_tea_kalamazoo.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/hdhajWh/ringtone_for_iphone_6_not_working.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
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_b1de04b911ac4b69a3f9ca0d370b0de0.pdf?index=trueIn PDF document text
    • https://71b34470-2e60-4936-811b-9f14cb47e32b.filesusr.com/ugd/1dbbf0_18415954902843038bd85bd09bea639f.pdf?index=trueIn PDF document text
    • http://tenasupufowok.epizy.com/adobe_flash_player_activex_latest_version.pdfIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_830880a891654dcea765a037bce655a2.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_32ef0c825b644bdca567616f97e31b1c.pdf?index=trueIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_65128a89306b47dfbb88784c41c36de2.pdf?index=trueIn PDF document text
    • http://borovob.epizy.com/go_math_book_7th_grade_answers.pdfIn PDF document text
    • http://zojabavikejowi.rf.gd/xbox_one_wireless_controller_headphone_jack.pdfIn PDF document text
    • http://ledafavegarawam.rf.gd/lal_badshah_movie_songs_free.pdfIn PDF document text
    • http://gozowemanebuj.epizy.com/papigozesapupugijuzisenev.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_2bca5bd9fab84040aa847d15ba06dd2b.pdf?index=trueIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_9eec825ee96a46abb7c25b48317d1de7.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_de4b0974087c49e29f485ad55fb06c4b.pdf?index=trueIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_e7053a6b1152461fb7c327a583363cb4.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_8a42921dbe024af28b314fb198313259.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_325fffbc56804383a095233f810071e3.pdf?index=trueIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_388f7f91ed6c479295f6db17ee22ae32.pdf?index=trueIn 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_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 5092 bytes
SHA-256: 9dfb0a9c449df5df211081909f0d71d42bbc47ab75559b916748749a9e4e6276
font_01_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 11520 bytes
SHA-256: 4811eb486282846e5d50ac6236a4b45a5a009e0ef41c6a9e5a3864d1670ff755
font_02_sfnt_off00011692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11692 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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