Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3cfc23abf09dd1…

MALICIOUS

PDF

45.1 KB Created: 2020-05-16 19:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 19e034240bd8f69aecf9d55f52ae067c SHA-1: 17abc42baf52fe522c5795fb8f57f6fba08545b7 SHA-256: 7d3cfc23abf09dd18035dd61c8b19db9b790ec87fc3d3038818ed2b6c5e124dd
184 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its extensive use of external links, forming a link farm designed to direct users to potentially harmful websites. The document body mentions 'Airtel prepaid recharge app', suggesting a lure to trick users into clicking these links. The presence of numerous suspicious URLs and the ML classifier's high confidence score indicate a strong likelihood of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 8

  • 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-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://gregjiel.com/uploads/1/3/1/3/131379029/131379029.html#airtel+prepaid+recharge+app PDF link annotation
    • http://cprenovations.ca/uploads/1/3/1/4/131438888/niduxa.pdfIn PDF document text
    • http://futuretranquilityproperties.org/uploads/1/3/0/5/130546971/ec14b2a159.pdfIn PDF document text
    • http://looksbeautyandnails.nl/uploads/1/3/0/2/130288383/dazemale.pdfIn PDF document text
    • http://alisonic.net/uploads/1/3/1/4/131452845/7728347.pdfIn PDF document text
    • http://ladieslearnenglish.com/uploads/1/3/1/4/131454549/teredujojetebalobaki.pdfIn PDF document text
    • http://punchlistms.com/uploads/1/3/1/0/131070846/wonuvumomip.pdfIn PDF document text
    • http://setransformations.com/uploads/1/3/1/3/131398515/da6eaca.pdfIn PDF document text
    • http://thinkredcreatives.com/uploads/1/3/1/3/131379037/b8f7a77581451.pdfIn PDF document text
    • http://pulleyslearningacademyand.com/uploads/1/3/0/7/130740443/1101673.pdfIn PDF document text
    • http://hemphealthco.com/uploads/1/3/0/8/130873995/e3b956ce.pdfIn PDF document text
    • http://clearcalmbreathe.com/uploads/1/3/0/5/130543488/vutujufi_tobefowebumakuw_ligunegozugura.pdfIn PDF document text
    • http://scottcmatsonllc.com/uploads/1/3/0/7/130775443/6802298.pdfIn PDF document text
    • http://onlinesecurityservice.site/uploads/1/3/0/5/130589389/fa7337549e4b339.pdfIn PDF document text
    • http://fancynancyshousecleaning.com/uploads/1/3/1/3/131398567/d0c423622068dd8.pdfIn PDF document text
    • http://iammattcruz.com/uploads/1/3/0/7/130738771/4158429.pdfIn PDF document text
    • http://kidds-corner.com/uploads/1/3/1/4/131454352/5814425.pdfIn PDF document text
    • http://ehousere.net/uploads/1/3/1/8/131872058/jepimo.pdfIn PDF document text
    • http://shipyourshape.com/uploads/1/3/1/3/131380466/6912718.pdfIn PDF document text
    • http://envisionnepal.org/uploads/1/3/0/4/130488227/gaxuduw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBB 11248 bytes
SHA-256: 40096842c6a76ddb7da799c82e9bea11832d59fcceaeb5724d9fc1971b1bd518
font_01_sfnt_off00009330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9330 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1