Malicious PDF — malware analysis report

Static analysis result for SHA-256 6add8cf198d046aa…

MALICIOUS

PDF

81.4 KB Created: 2021-03-14 23:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7152309da9137e6e8f4be553f6a4e159 SHA-1: 692096c39bfb7d16d0803034ec2ebd3e3fdc6d1e SHA-256: 6add8cf198d046aa349c6a38414abfc269d83907df0ad13c9ef413d1c6fb1024
176 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of malicious intent, including a malformed exploit stream and a high number of external links, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest maliciousness, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://lozipotod.ru/award?keyword=basic+esl+worksheets+pdf PDF link annotation
    • http://national-verifyteam.com/rrb_admit_admit_card8bwhu.pdfIn PDF document text
    • http://usacreditscore.info/93536742926lnkr9.pdfIn PDF document text
    • https://kapelasijad.weebly.com/uploads/1/3/4/3/134312752/92140199f272ee1.pdfIn PDF document text
    • http://adv-workshop.site/ribaxewugefudenetufusoljjple.pdfIn PDF document text
    • https://volifinidolil.weebly.com/uploads/1/3/0/8/130873876/9947708.pdfIn PDF document text
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/6273070.pdfIn PDF document text
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/515bdbf199d32b.pdfIn PDF document text
    • http://uspeh.icu/positive_mind_meaning_in_urduyj76i.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/intl_business_machines_stock.pdfIn PDF document text
    • https://gelupolo.weebly.com/uploads/1/3/5/3/135314506/ruwodugekogem_luletam_janemir_kenilugumuxifiw.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/zavikeduxu.pdfIn PDF document text
    • https://wevofuru.weebly.com/uploads/1/3/4/6/134670173/5c6148b17248039.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/kosipefojaw/most_emotional_status_video.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/57104393883.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/kenmore_70_series_dryer_heating_element_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/cab_full_form_in_nrc.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/drastic_emulator_android_gratuit.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/nadra_b_form_tracking_id.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/restaurant_positive_review_response_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/jealous_labrinth_piano_sheet_music.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_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 5448 bytes
SHA-256: 983d49a4b613e017fd65333f59a7ab6a8d2b7061cd489c95c5dde34fb04aa2c4
font_01_sfnt_off0001141c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141C 10644 bytes
SHA-256: 6c6b967bf313da539405e9bfe16d4fd2adc12dfb787c7eeebec8462f090fe278

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