Malicious PDF — malware analysis report

Static analysis result for SHA-256 d338fad12b9aab53…

MALICIOUS

PDF

78.1 KB Created: 2021-03-15 19:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c69772e33493e68a94d464fb9348bd9 SHA-1: 726a48bf118a425ca34f5fc50225e9246e1fe1b0 SHA-256: d338fad12b9aab53314013ec46676c8ec3cec704b398c1a21a19a0b0b1923c34
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs, such as 'https://xezojetit.ru/wix?keyword=kingroot+apk+4.0+uptodown', suggest a lure to download potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/wix?keyword=kingroot+apk+4.0+uptodown
    • https://tikivumisa.weebly.com/uploads/1/3/5/3/135346314/ca626c74e8d.pdf
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/e9653176c9.pdf
    • http://kugaraginoja.mypressonline.com/pelibuwemu.pdf
    • http://boxijogirexu.medianewsonline.com/zoology_books_free_download.pdf
    • http://mojadejazisapa.sportsontheweb.net/jivudo.pdf
    • http://ridaxaki.mywebcommunity.org/dimuzalakakaxunu.pdf
    • https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/zivakamolipidukuto.pdf
    • https://kaxalosenawa.weebly.com/uploads/1/3/4/5/134576513/4716703.pdf
    • http://nesebonuvobeju.getenjoyment.net/the_killing_pact_2017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6c599a8e-3b68-4c1e-952b-ce7848659b0b/what_does_enthalpy_mean_in_spanish.pdf
    • http://guxejusoselota.myartsonline.com/what_to_name_my_graphic_design_company.pdf
    • https://uploads.strikinglycdn.com/files/0e252398-ec4f-4bef-b395-01d4e017c75e/mr._coffee_one-touch_coffeehouse_espresso_maker_and_cappuccino_machine_reviews.pdf
    • https://uploads.strikinglycdn.com/files/9b1d3ae9-55e9-4f2a-aa68-1fb7ff95beaa/wudajalaxuxebidetiru.pdf
    • https://uploads.strikinglycdn.com/files/fa622c4c-7c54-4c68-b737-26a4fe2f1587/where_can_i_buy_singer_heavy_duty_4423_sewing_machine.pdf
    • https://s3.amazonaws.com/jukoxisojow/70308646603.pdf
    • https://uploads.strikinglycdn.com/files/d74554e8-b780-43fd-bd1e-d36b93f2401a/64138681136.pdf
    • http://megigezorozo.atwebpages.com/fujitsu_fi_7160_guide.pdf
    • https://uploads.strikinglycdn.com/files/8c2ed951-aeb5-4db9-883f-e2a4ae87c211/kejel.pdf
    • https://s3.amazonaws.com/kefodek/quantum_analyser_software.pdf
    • https://uploads.strikinglycdn.com/files/f2535364-1bf4-415e-b580-88f294a5dddb/zuxaxorevevosivarim.pdf
    • https://uploads.strikinglycdn.com/files/6245cc15-b41a-4575-820a-ef1df68d1b01/37989173868.pdf
    • http://nafaradevofipaf.myartsonline.com/83035585365.pdf
    • https://s3.amazonaws.com/lakadutof/78966090799.pdf
    • https://uploads.strikinglycdn.com/files/2a6bbe23-8185-4994-9729-83ab5a4dfb39/how_to_take_the_back_off_a_bulova_watch.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_off0000e3bd.bin
f2adf44608a71f17950f3e542b9a9a2b007194a9ff95374a107372b2883bb975		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 5068 bytes
font_01_sfnt_off0000f510.bin
763b4587499ae78b995c385927f69b00eeabc6b20269b60f0d9edeafc2637068		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 12608 bytes
font_02_sfnt_off00011b9b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 4324 bytes

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