Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cd310ec1db2d47…

MALICIOUS

PDF

74.5 KB Created: 2021-02-24 19:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 19c4d7218770d9d3286bfb2f4e5438cd SHA-1: 07eb70f5fc34e030228f0f5d14bc604d07ad66f1 SHA-256: e2cd310ec1db2d4760fbcfcac8b0e42ada2322d66dae603ae0be15bdcd52e53b
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is malformed and contains a mass of external links, many of which are SEO redirectors. The primary URL, 'https://jottigo.ru/123?utm_term=dell+optiplex+7010+sff+core+i3+review', is presented as a hardware review but is likely a lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/123?utm_term=dell+optiplex+7010+sff+core+i3+review PDF link annotation
    • https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/e88aa09.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/bibs49i/20815315355.pdfIn PDF document text
    • https://garixapevawena.weebly.com/uploads/1/3/4/4/134495328/1562469.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/zafaronivaj/halloween_bake_sale_flyer_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/tobonumitirub.pdfIn PDF document text
    • http://kiwaxebaka.rf.gd/28321647048.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/47541720377.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/kewesofagitigog.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/brother_p-touch_pt-d210_label_maker_staples.pdfIn PDF document text
    • http://temoweboriti.rf.gd/bad_boy_bubby_1993_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/10374458545.pdfIn PDF document text
    • http://kuvuzoruzanawip.epizy.com/gupatitudewajibarudas.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/chadi_lage_cham_cham_song.pdfIn PDF document text
    • http://finubovuputok.epizy.com/aifmd_reporting_obligations.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_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 5456 bytes
SHA-256: 6c28a0ec934fb326ce0b2430b23b82c4dcda9a6401d4adae258b5776a0629b4e
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 10452 bytes
SHA-256: e5f25c6c9b3a3a361190ad7b7f33955d2e31b31f63d202586a425499bd0ee6f1

Open this report in the interactive analyzer, or submit your own file for analysis.